Push cilium-agent-proxy on release

Signed-off-by: Daichi Sakaue <[email protected]>

.github/workflows/release.yaml

@@ -24,6 +24,21 @@ jobs:
               echo "Tag v${{ inputs.tag }} already exists"
               exit 1
           fi
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and Push cilium-agent-proxy
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ghcr.io/cybozu-go/cilium-agent-proxy:${{ inputs.tag }}
       - uses: actions/setup-go@v4
         with:
           go-version-file: go.mod