feat(ci): automatically build and push container images

.github/workflows/publish-container.yaml

@@ -0,0 +1,47 @@
+name: Publish Container Image
+on:
+  push:
+    tags: [ 'v*' ]
+
+jobs:
+  publish-container:
+    runs-on: ubuntu-latest
+    steps:
+
+      - uses: actions/checkout@v4
+
+      - name: Set version number
+        run: |
+          echo "VERSION=${GITHUB_REF:11}" >> $GITHUB_ENV
+          echo "DOCKER_REPOSITORY=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push controller
+        uses: docker/build-push-action@v2
+        with:
+          context: ./hairpin-proxy-controller
+          push: true
+          build-args: version=${{ env.VERSION }}
+          tags: |
+            ghcr.io/${{ env.DOCKER_REPOSITORY }}/controller:latest
+            ghcr.io/${{ env.DOCKER_REPOSITORY }}/controller:${{ env.VERSION }}
+          cache-from: type=registry,ref=ghcr.io/${{ env.DOCKER_REPOSITORY }}/controller:latest
+          cache-to: type=inline
+
+      - name: Build and push haproxy
+        uses: docker/build-push-action@v2
+        with:
+          context: ./hairpin-proxy-haproxy
+          push: true
+          build-args: version=${{ env.VERSION }}
+          tags: |
+            ghcr.io/${{ env.DOCKER_REPOSITORY }}/haproxy:latest
+            ghcr.io/${{ env.DOCKER_REPOSITORY }}/haproxy:${{ env.VERSION }}
+          cache-from: type=registry,ref=ghcr.io/${{ env.DOCKER_REPOSITORY }}/haproxy:latest
+          cache-to: type=inline