✨ Test image build on Dockerfile change

Signed-off-by: Scott J Dickerson <[email protected]>

.github/workflows/ci-Dockerfile.yml

@@ -0,0 +1,99 @@
+name: CI (test image build for a PR with a Dockerfile change)
+
+on:
+  pull_request:
+    branches:
+      - "main"
+      - "release-*"
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    outputs:
+      run-test-image-build: ${{ steps.dockerChanged.outputs.flag }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log the PR event
+        env:
+          GH: ${{ toJson(github.event.pull_request) }}
+        run: |
+          cat >> "$GITHUB_STEP_SUMMARY" <<EOF
+            \`\`\`json
+            $(echo "$GH" | jq '.')
+            \`\`\`
+          EOF
+
+      - name: Dockerfile changed?
+        id: changed-Dockerfile
+        uses: tj-actions/changed-files@v44
+        with:
+          files: |
+            Dockerfile
+
+      - name: Check if the `Dockerfile` has been changed by a PR
+        id: dockerChanged
+        env:
+          IS_PR: ${{ !!github.event.pull_request }}
+          CHANGED: ${{ steps.dockerChanged.outputs.test_any_changed }}
+        run: |
+          INCLUDES_DOCKERFILE=$(
+            if [[ $(git show --raw --oneline HEAD -- Dockerfile | wc --lines) -eq 0 ]]; then
+              echo "false"
+            else
+              echo "true"
+            fi
+          )
+
+          TEST_IMAGE_BUILD=$(
+            if [[ $IS_PR == true ]] && [[ $INCLUDES_DOCKERFILE == true ]]; then
+              echo "true"
+            else
+              echo "false"
+            fi
+          )
+
+          cat >> "$GITHUB_STEP_SUMMARY" <<EOF
+            PR triggered? \`$IS_PR\`
+            HEAD commit include a Dockerfile change? \`$INCLUDES_DOCKERFILE\`
+            Should the image build be tested? \`$TEST_IMAGE_BUILD\`
+
+            CHANGED: \`$CHANGED\`
+          EOF
+          echo "flag=$TEST_IMAGE_BUILD" >> "$GITHUB_OUTPUT"
+
+  #
+  # Based on:
+  #   - image-build.yaml
+  #   - konveyor/release-tools/.github/workflows/build-push-images.yaml@main
+  #
+  # Only test the image build, no push to quay is required.
+  #
+  test-image-build:
+    runs-on: ubuntu-latest
+    needs: checks
+    if: ${{ needs.checks.outputs.run-test-image-build == true }}
+
+    strategy:
+      fail-fast: true
+      matrix:
+        architecture:
+          - amd64
+          - arm64
+
+    steps:
+      - name: Checkout merge commit for PR${{ github.event.pull_request.number }}
+        uses: actions/checkout@v4
+
+      - name: Test build image on ${{ matrix.architecture }}
+        id: test-build
+        uses: redhat-actions/buildah-build@main
+        with:
+          image: "tackle2-ui"
+          tags: PR${{ github.event.pull_request.number }}-${{ matrix.architecture }}
+          extra-args: "--no-cache --rm --ulimit nofile=4096:4096"
+          archs: ${{ matrix.architecture }}
+          labels: ""
+          containerfiles: "./Dockerfile"
+          context: "."

.github/workflows/ci-repo.yml

@@ -17,10 +17,11 @@ on:
   workflow_dispatch:
 
 jobs:
-  unit-test-lookup-image:
+  unit-test-lookups:
     runs-on: ubuntu-latest
     outputs:
       builder-image: ${{ steps.grepBuilder.outputs.builder }}
+
     steps:
       - uses: actions/checkout@v4
 
@@ -33,10 +34,10 @@ jobs:
 
   unit-test:
     runs-on: ubuntu-latest
-    needs: unit-test-lookup-image
+    needs: unit-test-lookups
 
     # Use the same container as the Dockerfile's "FROM * as builder"
-    container: ${{ needs.unit-test-lookup-image.outputs.builder-image }}
+    container: ${{ needs.unit-test-lookups.outputs.builder-image }}
 
     steps:
       - uses: actions/checkout@v4