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.gitea/workflows/build-and-push.yaml

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+# =============================================================================
+# Gitea Actions workflow (active for THIS repository).
+# Builds examples/Dockerfile and pushes it to Harbor as a smoke test of the
+# k3s runner + DinD + Harbor pipeline.
+#
+# Required repo/org Actions secrets:
+#     HARBOR_REGISTRY, HARBOR_USERNAME, HARBOR_PASSWORD
+# Optional repo/org Actions variable:
+#     HARBOR_PROJECT  (default: "library")
+# =============================================================================
+name: build-and-push
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-22.04
+    env:
+      HARBOR_PROJECT: ${{ vars.HARBOR_PROJECT || 'library' }}
+      IMAGE_NAME: build-on-k3s-sample
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Compute image tags
+        id: meta
+        run: |
+          IMAGE="${{ secrets.HARBOR_REGISTRY }}/${HARBOR_PROJECT}/${IMAGE_NAME}"
+          echo "image=${IMAGE}"            >> "$GITHUB_OUTPUT"
+          echo "sha=${GITHUB_SHA::12}"     >> "$GITHUB_OUTPUT"
+
+      - name: Log in to Harbor
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ secrets.HARBOR_REGISTRY }}
+          username: ${{ secrets.HARBOR_USERNAME }}
+          password: ${{ secrets.HARBOR_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: ./examples
+          file: ./examples/Dockerfile
+          push: true
+          tags: |
+            ${{ steps.meta.outputs.image }}:latest
+            ${{ steps.meta.outputs.image }}:${{ steps.meta.outputs.sha }}