shibayan · shibayan · Aug 2, 2026 · Aug 2, 2026
diff --git a/.github/actions/smoke-test/build.sh b/.github/actions/smoke-test/build.sh
@@ -8,6 +8,26 @@ shopt -s dotglob
 SRC_DIR="/tmp/${TEMPLATE_ID}"
 cp -R "src/${TEMPLATE_ID}" "${SRC_DIR}"
 
+export DOCKER_BUILDKIT=1
+echo "(*) Installing @devcontainer/cli"
+npm install -g @devcontainers/cli
+
+PREBUILD_DIR="prebuild/${TEMPLATE_ID}"
+if [ -d "${PREBUILD_DIR}" ] ; then
+    RUNTIME_OPTION=$(jq -r '.options | keys[] | select(. != "azureFunctionsCliVersion")' "src/${TEMPLATE_ID}/devcontainer-template.json")
+    RUNTIME_VERSION=$(jq -r ".options | .${RUNTIME_OPTION} | .default" "src/${TEMPLATE_ID}/devcontainer-template.json")
+    PREBUILD_IMAGE="ghcr.io/shibayan/devcontainers/${TEMPLATE_ID}:${RUNTIME_VERSION}-noble"
+
+    if [ -z "${RUNTIME_OPTION}" ] || [ -z "${RUNTIME_VERSION}" ] || [ "${RUNTIME_VERSION}" = "null" ] ; then
+        echo "Unable to determine the runtime version for '${TEMPLATE_ID}'"
+        exit 1
+    fi
+
+    echo "(*) Building prebuild image '${PREBUILD_IMAGE}'"
+    export RUNTIME_VERSION
+    devcontainer build --workspace-folder "${PREBUILD_DIR}" --image-name "${PREBUILD_IMAGE}"
+fi
+
 pushd "${SRC_DIR}"
 
 # Configure templates only if `devcontainer-template.json` contains the `options` property.
@@ -46,10 +66,6 @@ if [ -d "${TEST_DIR}" ] ; then
     cp test/test-utils/* ${DEST_DIR}
 fi
 
-export DOCKER_BUILDKIT=1
-echo "(*) Installing @devcontainer/cli"
-npm install -g @devcontainers/cli
-
 echo "Building Dev Container"
 ID_LABEL="test-container=${TEMPLATE_ID}"
 devcontainer up --id-label ${ID_LABEL} --workspace-folder "${SRC_DIR}"
diff --git a/.github/workflows/prebuild.yml b/.github/workflows/prebuild.yml
@@ -0,0 +1,135 @@
+name: "Prebuild Dev Container Images"
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+    paths:
+      - "prebuild/**"
+      - ".github/workflows/prebuild.yml"
+      - "src/*/devcontainer-template.json"
+  schedule:
+    - cron: "23 17 * * 0"
+
+concurrency:
+  group: prebuild-dev-container-images
+  cancel-in-progress: false
+
+jobs:
+  prepare:
+    runs-on: ubuntu-24.04
+    outputs:
+      configs: ${{ steps.matrix.outputs.configs }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Generate prebuild matrix
+        id: matrix
+        shell: bash
+        run: |
+          configs=$(
+            for manifest in src/*/devcontainer-template.json; do
+              template=$(basename "$(dirname "${manifest}")")
+              jq -c --arg template "${template}" '
+                [
+                  .options
+                  | to_entries[]
+                  | select(.key != "azureFunctionsCliVersion")
+                  | .value.proposals[] as $runtime
+                  | { template: $template, runtime: $runtime }
+                ]
+              ' "${manifest}"
+            done | jq -sc 'add'
+          )
+          echo "configs=${configs}" >> "${GITHUB_OUTPUT}"
+
+  build:
+    needs: prepare
+    runs-on: ${{ matrix.os }}
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        config: ${{ fromJSON(needs.prepare.outputs.configs) }}
+        os:
+          - ubuntu-24.04
+          - ubuntu-24.04-arm
+    env:
+      RUNTIME_VERSION: ${{ matrix.config.runtime }}
+      IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/devcontainers/${{ matrix.config.template }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Log in to GitHub Container Registry
+        shell: bash
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io --username "${{ github.actor }}" --password-stdin
+
+      - name: Install Dev Container CLI
+        shell: bash
+        run: npm install --global @devcontainers/cli
+
+      - name: Build and push architecture image
+        shell: bash
+        env:
+          RUNNER_ARCHITECTURE: ${{ runner.arch }}
+        run: |
+          case "${RUNNER_ARCHITECTURE}" in
+            X64) architecture=amd64 ;;
+            ARM64) architecture=arm64 ;;
+            *) echo "Unsupported runner architecture: ${RUNNER_ARCHITECTURE}" >&2; exit 1 ;;
+          esac
+
+          devcontainer build \
+            --workspace-folder "prebuild/${{ matrix.config.template }}" \
+            --image-name "${IMAGE_NAME}:${RUNTIME_VERSION}-noble-${architecture}" \
+            --label "org.opencontainers.image.source=https://github.com/${GITHUB_REPOSITORY}" \
+            --label "org.opencontainers.image.revision=${GITHUB_SHA}" \
+            --label "org.opencontainers.image.version=${RUNTIME_VERSION}-noble" \
+            --push true
+
+  merge:
+    needs:
+      - prepare
+      - build
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        config: ${{ fromJSON(needs.prepare.outputs.configs) }}
+    env:
+      IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/devcontainers/${{ matrix.config.template }}
+      RUNTIME_VERSION: ${{ matrix.config.runtime }}
+    steps:
+      - name: Log in to GitHub Container Registry
+        shell: bash
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io --username "${{ github.actor }}" --password-stdin
+
+      - name: Create multi-architecture image
+        shell: bash
+        run: |
+          tag="${RUNTIME_VERSION}-noble"
+          dated_tag="${tag}-$(date -u +%Y%m%d)"
+          revision_tag="${tag}-sha-${GITHUB_SHA::7}"
+
+          docker buildx imagetools create \
+            --tag "${IMAGE_NAME}:${tag}" \
+            --tag "${IMAGE_NAME}:${dated_tag}" \
+            --tag "${IMAGE_NAME}:${revision_tag}" \
+            "${IMAGE_NAME}:${tag}-amd64" \
+            "${IMAGE_NAME}:${tag}-arm64"
+
+      - name: Verify image platforms
+        shell: bash
+        run: |
+          manifest=$(docker buildx imagetools inspect --raw "${IMAGE_NAME}:${RUNTIME_VERSION}-noble")
+          for architecture in amd64 arm64; do
+            jq -e --arg architecture "${architecture}" '
+              any(.manifests[]; .platform.os == "linux" and .platform.architecture == $architecture)
+            ' <<< "${manifest}" > /dev/null
+          done
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
@@ -13,6 +13,26 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
+      - name: Verify prebuild images
+        shell: bash
+        run: |
+          for manifest_path in src/*/devcontainer-template.json; do
+            template=$(basename "$(dirname "${manifest_path}")")
+            runtime_option=$(jq -r '.options | keys[] | select(. != "azureFunctionsCliVersion")' "${manifest_path}")
+
+            while IFS= read -r runtime_version; do
+              image="ghcr.io/${GITHUB_REPOSITORY_OWNER}/devcontainers/${template}:${runtime_version}-noble"
+              echo "Verifying ${image}"
+              manifest=$(docker buildx imagetools inspect --raw "${image}")
+
+              for architecture in amd64 arm64; do
+                jq -e --arg architecture "${architecture}" '
+                  any(.manifests[]; .platform.os == "linux" and .platform.architecture == $architecture)
+                ' <<< "${manifest}" > /dev/null
+              done
+            done < <(jq -r ".options.${runtime_option}.proposals[]" "${manifest_path}")
+          done
+
       - name: "Publish Templates"
         uses: devcontainers/action@1082abd5d2bf3a11abccba70eef98df068277772 # v1.4.3
         with:

diff --git a/.github/workflows/test-pr.yml b/.github/workflows/test-pr.yml
@@ -12,17 +12,46 @@ jobs:
         id: filter
         with:
           filters: |
-            azure-functions-dotnet: ./**/azure-functions-dotnet/**
-            azure-functions-go: ./**/azure-functions-go/**
-            azure-functions-java: ./**/azure-functions-java/**
-            azure-functions-node: ./**/azure-functions-node/**
-            azure-functions-powershell: ./**/azure-functions-powershell/**
-            azure-functions-python: ./**/azure-functions-python/**
+            azure-functions-dotnet:
+              - ./**/azure-functions-dotnet/**
+              - .github/actions/smoke-test/**
+              - .github/workflows/prebuild.yml
+              - test/test-utils/**
+              - .github/workflows/test-pr.yml
+            azure-functions-go:
+              - ./**/azure-functions-go/**
+              - .github/actions/smoke-test/**
+              - .github/workflows/prebuild.yml
+              - test/test-utils/**
+              - .github/workflows/test-pr.yml
+            azure-functions-java:
+              - ./**/azure-functions-java/**
+              - .github/actions/smoke-test/**
+              - .github/workflows/prebuild.yml
+              - test/test-utils/**
+              - .github/workflows/test-pr.yml
+            azure-functions-node:
+              - ./**/azure-functions-node/**
+              - .github/actions/smoke-test/**
+              - .github/workflows/prebuild.yml
+              - test/test-utils/**
+              - .github/workflows/test-pr.yml
+            azure-functions-powershell:
+              - ./**/azure-functions-powershell/**
+              - .github/actions/smoke-test/**
+              - .github/workflows/prebuild.yml
+              - test/test-utils/**
+              - .github/workflows/test-pr.yml
+            azure-functions-python:
+              - ./**/azure-functions-python/**
+              - .github/actions/smoke-test/**
+              - .github/workflows/prebuild.yml
+              - test/test-utils/**
+              - .github/workflows/test-pr.yml
 
   test:
     needs: [detect-changes]
     runs-on: ${{ matrix.os }}
-    continue-on-error: true
     strategy:
       matrix:
         templates: ${{ fromJSON(needs.detect-changes.outputs.templates) }}

diff --git a/README.md b/README.md
@@ -15,6 +15,8 @@ A collection of [Dev Container Templates](https://containers.dev/implementors/te
 
 > All templates include the Azure Functions Core Tools (version selectable, default: `latest`).
 
+All language runtimes are provided through prebuilt Ubuntu 24.04 images for both AMD64 and ARM64. The templates add the selected Azure Functions Core Tools version when the development container is created.
+
 ## Usage
 
 1. Open the Command Palette in VS Code and select **Dev Containers: Add Dev Container Configuration Files...**

diff --git a/prebuild/azure-functions-dotnet/.devcontainer/Dockerfile b/prebuild/azure-functions-dotnet/.devcontainer/Dockerfile
@@ -0,0 +1,2 @@
+ARG RUNTIME_VERSION
+FROM mcr.microsoft.com/devcontainers/dotnet:${RUNTIME_VERSION}-noble
diff --git a/prebuild/azure-functions-dotnet/.devcontainer/devcontainer.json b/prebuild/azure-functions-dotnet/.devcontainer/devcontainer.json
@@ -0,0 +1,9 @@
+{
+  "name": "Azure Functions (.NET) Prebuild",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "args": {
+      "RUNTIME_VERSION": "${localEnv:RUNTIME_VERSION}"
+    }
+  }
+}
diff --git a/prebuild/azure-functions-go/.devcontainer/Dockerfile b/prebuild/azure-functions-go/.devcontainer/Dockerfile
@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/base:noble
diff --git a/prebuild/azure-functions-go/.devcontainer/devcontainer.json b/prebuild/azure-functions-go/.devcontainer/devcontainer.json
@@ -0,0 +1,11 @@
+{
+  "name": "Azure Functions (Go) Prebuild",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/go:1": {
+      "version": "${localEnv:RUNTIME_VERSION}"
+    }
+  }
+}
diff --git a/prebuild/azure-functions-java/.devcontainer/Dockerfile b/prebuild/azure-functions-java/.devcontainer/Dockerfile
@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/base:noble
diff --git a/prebuild/azure-functions-java/.devcontainer/devcontainer.json b/prebuild/azure-functions-java/.devcontainer/devcontainer.json
@@ -0,0 +1,12 @@
+{
+  "name": "Azure Functions (Java) Prebuild",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/java:1": {
+      "version": "${localEnv:RUNTIME_VERSION}",
+      "installMaven": true
+    }
+  }
+}
diff --git a/prebuild/azure-functions-node/.devcontainer/Dockerfile b/prebuild/azure-functions-node/.devcontainer/Dockerfile
@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/base:noble
diff --git a/prebuild/azure-functions-node/.devcontainer/devcontainer.json b/prebuild/azure-functions-node/.devcontainer/devcontainer.json
@@ -0,0 +1,11 @@
+{
+  "name": "Azure Functions (Node.js) Prebuild",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/node:1": {
+      "version": "${localEnv:RUNTIME_VERSION}"
+    }
+  }
+}
diff --git a/prebuild/azure-functions-powershell/.devcontainer/Dockerfile b/prebuild/azure-functions-powershell/.devcontainer/Dockerfile
@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/dotnet:8.0-noble
diff --git a/prebuild/azure-functions-powershell/.devcontainer/devcontainer.json b/prebuild/azure-functions-powershell/.devcontainer/devcontainer.json
@@ -0,0 +1,11 @@
+{
+  "name": "Azure Functions (PowerShell) Prebuild",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/powershell:1": {
+      "version": "${localEnv:RUNTIME_VERSION}"
+    }
+  }
+}
diff --git a/prebuild/azure-functions-python/.devcontainer/Dockerfile b/prebuild/azure-functions-python/.devcontainer/Dockerfile
@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/base:noble
diff --git a/prebuild/azure-functions-python/.devcontainer/devcontainer.json b/prebuild/azure-functions-python/.devcontainer/devcontainer.json
@@ -0,0 +1,12 @@
+{
+  "name": "Azure Functions (Python) Prebuild",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "${localEnv:RUNTIME_VERSION}",
+      "installTools": false
+    }
+  }
+}
diff --git a/src/azure-functions-dotnet/.devcontainer/Dockerfile b/src/azure-functions-dotnet/.devcontainer/Dockerfile
@@ -1 +1 @@
-FROM mcr.microsoft.com/devcontainers/dotnet:${templateOption:dotnetVersion}-noble
+FROM ghcr.io/shibayan/devcontainers/azure-functions-dotnet:${templateOption:dotnetVersion}-noble
diff --git a/src/azure-functions-dotnet/devcontainer-template.json b/src/azure-functions-dotnet/devcontainer-template.json
@@ -1,6 +1,6 @@
 {
   "id": "azure-functions-dotnet",
-  "version": "2.0.5",
+  "version": "2.0.6",
   "name": "Azure Functions (.NET)",
   "description": "Develop C# and .NET based Azure Functions. Includes all needed SDKs, extensions, and dependencies.",
   "documentationURL": "https://github.com/shibayan/devcontainers/tree/master/src/azure-functions-dotnet",

diff --git a/src/azure-functions-go/.devcontainer/Dockerfile b/src/azure-functions-go/.devcontainer/Dockerfile
@@ -1 +1 @@
-FROM mcr.microsoft.com/devcontainers/base:noble
+FROM ghcr.io/shibayan/devcontainers/azure-functions-go:${templateOption:goVersion}-noble
diff --git a/src/azure-functions-go/.devcontainer/devcontainer.json b/src/azure-functions-go/.devcontainer/devcontainer.json
@@ -13,9 +13,6 @@
     "onAutoForward": "ignore"
   },
   "features": {
-    "ghcr.io/devcontainers/features/go:1": {
-      "version": "${templateOption:goVersion}"
-    },
     "ghcr.io/jlaundry/devcontainer-features/azure-functions-core-tools:1": {
       "version": "${templateOption:azureFunctionsCliVersion}"
     }

diff --git a/src/azure-functions-go/devcontainer-template.json b/src/azure-functions-go/devcontainer-template.json
@@ -1,6 +1,6 @@
 {
   "id": "azure-functions-go",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "name": "Azure Functions (Go)",
   "description": "Develop Go based Azure Functions. Includes all needed SDKs, extensions, and dependencies.",
   "documentationURL": "https://github.com/shibayan/devcontainers/tree/master/src/azure-functions-go",

diff --git a/src/azure-functions-java/.devcontainer/Dockerfile b/src/azure-functions-java/.devcontainer/Dockerfile
@@ -1 +1 @@
-FROM mcr.microsoft.com/devcontainers/base:noble
+FROM ghcr.io/shibayan/devcontainers/azure-functions-java:${templateOption:javaVersion}-noble
diff --git a/src/azure-functions-java/.devcontainer/devcontainer.json b/src/azure-functions-java/.devcontainer/devcontainer.json
@@ -13,10 +13,6 @@
     "onAutoForward": "ignore"
   },
   "features": {
-    "ghcr.io/devcontainers/features/java:1": {
-      "version": "${templateOption:javaVersion}",
-      "installMaven": true
-    },
     "ghcr.io/jlaundry/devcontainer-features/azure-functions-core-tools:1": {
       "version": "${templateOption:azureFunctionsCliVersion}"
     }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		ARG RUNTIME_VERSION
		FROM mcr.microsoft.com/devcontainers/dotnet:${RUNTIME_VERSION}-noble
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		FROM mcr.microsoft.com/devcontainers/base:noble
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		FROM mcr.microsoft.com/devcontainers/dotnet:${templateOption:dotnetVersion}-noble
		FROM ghcr.io/shibayan/devcontainers/azure-functions-dotnet:${templateOption:dotnetVersion}-noble