Add github actions

.github/workflows/release.yaml

@@ -0,0 +1,47 @@
+name: release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: 1.20.x
+
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/learning-cloud-native-go/myapp
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          push: true
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ghcr.io/learning-cloud-native-go/myapp:latest
+            ghcr.io/learning-cloud-native-go/myapp:${{github.ref_name}}
+          labels: ${{ steps.meta.outputs.labels }}