feat: separate CI workflows for building, validating, and publishing Docker images

.forgejo/workflows/build-and-validate.yaml

@@ -0,0 +1,53 @@
+name: Build and Publish Docker Image
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-and-validate:
+    name: Build and Validate
+    runs-on: ubuntu
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Validate PR Title
+        run: |
+          PR_TITLE="${{ github.event.pull_request.title }}"
+          echo "PR Title: $PR_TITLE"
+          
+          # Check if PR title starts with valid prefix
+          if [[ "$PR_TITLE" =~ ^(Release|Feature|Hotfix|Bugfix)/ ]]; then
+            echo "✅ PR title is valid: $PR_TITLE"
+          else
+            echo "❌ PR title must start with one of: Release/, Feature/, Hotfix/, or Bugfix/"
+            echo "Current title: $PR_TITLE"
+            exit 1
+          fi
+
+      - name: Build Docker Image
+        run: |
+          docker build --build-arg VERSION=test --build-arg BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ") -t threejs-test:test .
+
+      - name: Validate Image
+        run: |
+          docker run --rm -d --name test-container -p 8080:80 threejs-test:test
+          sleep 2
+          curl -f http://localhost:8080 || exit 1
+          docker stop test-container
+
+      - name: Job Summary
+        if: success()
+        run: |
+          SUMMARY_FILE="${FORGEJO_STEP_SUMMARY}"
+          cat >> "$SUMMARY_FILE" << 'EOF'
+          ## ✅ Build and Validation Complete
+          
+          - ✅ Docker image built successfully
+          - ✅ Image validated (container started and HTTP check passed)
+          
+          The image is ready for deployment.
+          EOF
+          cat "$SUMMARY_FILE"