GitHub workflows for docker image

Author: mattn

.github/workflows/docker.yaml

@@ -0,0 +1,48 @@
+name: publish docker image
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  push_to_registry:
+    name: Docker
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out the repo
+      uses: actions/checkout@v3
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+
+    - name: Set up Docker Buildx
+      id: buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@v3
+      with:
+        images: ghcr.io/${{ github.repository }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        platforms: linux/amd64
+        builder: ${{ steps.buildx.outputs.name }}
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: |
+          ghcr.io/${{ github.repository }}:latest
+          ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        cache-from: type=gha
+        cache-to: type=gha,mode=max