ci: separate PR title validation from build jobs

.github/workflows/ci.yml

@@ -5,24 +5,12 @@ on:
     branches:
       - main
   pull_request:
-    types: [opened, edited, synchronize, reopened]
+    types: [opened, synchronize, reopened]
 
 jobs:
   test:
     runs-on: blacksmith-4vcpu-ubuntu-2404
     steps:
-      - name: Validate Conventional Commit title
-        if: github.event_name == 'pull_request'
-        env:
-          PR_TITLE: ${{ github.event.pull_request.title }}
-        shell: bash
-        run: |
-          pattern='^[a-z][a-z0-9-]*(\([^()]+\))?(!)?: .+'
-          if [[ ! $PR_TITLE =~ $pattern ]]; then
-            echo "Pull request titles must use Conventional Commit syntax." >&2
-            echo "Examples: feat: add a feature, fix(api): correct behavior, feat!: break compatibility" >&2
-            exit 1
-          fi
       - uses: useblacksmith/checkout@v1
       - uses: dtolnay/rust-toolchain@master
         with:

.github/workflows/pr-title.yml

@@ -0,0 +1,21 @@
+name: pr-title
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+jobs:
+  pr-title:
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    steps:
+      - name: Validate Conventional Commit title
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        shell: bash
+        run: |
+          pattern='^[a-z][a-z0-9-]*(\([^()]+\))?(!)?: .+'
+          if [[ ! $PR_TITLE =~ $pattern ]]; then
+            echo "Pull request titles must use Conventional Commit syntax." >&2
+            echo "Examples: feat: add a feature, fix(api): correct behavior, feat!: break compatibility" >&2
+            exit 1
+          fi