Add Forgejo CI/CD workflow for Docker build & push

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.forgejo/workflows/build-push.yml

@@ -0,0 +1,28 @@
+name: Build & Push Container Image
+
+on:
+  push:
+    branches: [main]
+
+env:
+  REGISTRY: git.faralmail.com
+  IMAGE_PREFIX: faral
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Short SHA
+        run: echo "SHORT_SHA=$(echo $GITHUB_SHA | cut -c1-7)" >> "$GITHUB_ENV"
+
+      - name: Login to Forgejo Registry
+        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login $REGISTRY -u ${{ github.repository_owner }} --password-stdin
+
+      - name: Build and push
+        run: |
+          TAG="${REGISTRY}/${IMAGE_PREFIX}/pokerface"
+          docker build -t "${TAG}:${{ github.run_number }}-${SHORT_SHA}" -t "${TAG}:latest" .
+          docker push "${TAG}:${{ github.run_number }}-${SHORT_SHA}"
+          docker push "${TAG}:latest"