Fix build issues on modern docker + GIT_VERSION

Author: vdboor

skaffold-builder.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -e
+
+cd $(dirname $0)
+
+# https://github.com/moby/moby/issues/42845
+export DOCKER_BUILDKIT=0
+
+export GIT_VERSION="$(git describe --tags --abbrev=0)@$(git rev-parse HEAD)"
+docker build --pull --progress=tty --build-arg "GIT_VERSION=$GIT_VERSION" -t "$IMAGE" "$BUILD_CONTEXT"
+
+if $PUSH_IMAGE; then
+    docker push $IMAGE
+fi

skaffold.yml

@@ -4,9 +4,11 @@ build:
   artifacts:
     - image: fluentdemo
       context: .
-      docker:
-        buildArgs:
-          GIT_VERSION: '{{if .IMAGE_TAG}}{{.IMAGE_TAG}}{{else}}0.0.0dev0{{end}}'
+      custom:
+        buildCommand: sh skaffold-builder.sh
+      #docker:
+      #  buildArgs:
+      #    GIT_VERSION: '{{if .IMAGE_TAG}}{{.IMAGE_TAG}}{{else}}0.0.0dev0{{end}}'
   tagPolicy:
     gitCommit:
       ignoreChanges: true  # no -dirty flag