docker ci

.github/workflows/docker.yml

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+name: CI to Docker Hub
+
+on:
+  push:
+    tags:
+      - "**"
+
+jobs:
+
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-qemu-action@v2 # for multi-architecture builds
+      - id: buidlx
+        uses: docker/setup-buildx-action@v1
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      - uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+      - id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64, linux/arm64
+          push: true
+          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/qzyq-water-sub:${{ github.ref_name }}
+          builder: ${{ steps.buildx.outputs.name }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}
+

Dockerfile

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+# syntax=docker/dockerfile:1
+
+FROM node:lts-alpine as frontend_builder
+WORKDIR /app
+COPY frontend/ .
+RUN npm install
+RUN npm run build
+
+FROM golang:1.16-alpine as backend_builder
+COPY . .
+COPY --from=frontend_builder /app/build ./frontend/
+RUN go mod download
+RUN go build -o /app
+
+FROM alpine:latest
+COPY --from=backend_builder /app /app
+EXPOSE 8080
+CMD /app -addr 0.0.0.0 -port 8080