ci(gh-actions): add publish job to build workflow

.github/workflows/build.yml

@@ -4,9 +4,13 @@ name: build
 
 on:
   push:
-    branches: [ "main" ]
+    branches:
+      - main
+    tags:
+      - v*
   pull_request:
-    branches: [ "main" ]
+    branches:
+      - main
 
 jobs:
   build:
@@ -25,3 +29,42 @@ jobs:
 
       - name: Test
         run: go test -v ./...
+
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to container registry
+        if: github.ref_type == 'tag'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      - name: Build and push container image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.ref_type == 'tag' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max