Publish amd64/arm64 images to GHCR

Author: stefanprodan

.github/workflows/release.yml

@@ -21,13 +21,44 @@ jobs:
           cd config/release
           kustomize edit set image fluxcd/source-controller=fluxcd/source-controller:${{ steps.get_version.outputs.VERSION }}
           kustomize build . > source-controller.yaml
-      - name: Push image
-        uses: docker/build-push-action@v1
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@master
         with:
-          username: ${{ secrets.DOCKER_FLUXCD_USER }}
+          platforms: all
+      - name: Setup Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@master
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: fluxcdbot
+          password: ${{ secrets.GHCR_TOKEN }}
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: fluxcdbot
           password: ${{ secrets.DOCKER_FLUXCD_PASSWORD }}
-          repository: fluxcd/source-controller
-          tag_with_ref: true
+      - name: Publish amd64 image
+        uses: docker/build-push-action@v2-build-push
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64
+          tags: |
+            ghcr.io/fluxcd/source-controller:${{ steps.get_version.outputs.VERSION }}
+            docker.io/fluxcd/source-controller:${{ steps.get_version.outputs.VERSION }}
+      - name: Publish arm64 image
+        uses: docker/build-push-action@v2-build-push
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          file: ./Dockerfile
+          platforms: linux/arm64
+          tags: ghcr.io/fluxcd/source-controller-arm64:${{ steps.get_version.outputs.VERSION }}
       - name: Create release
         id: create_release
         uses: actions/create-release@latest

Dockerfile

@@ -1,4 +1,5 @@
-FROM golang:1.14 as builder
+# Docker buildkit multi-arch build requires golang alpine
+FROM golang:1.14-alpine as builder
 
 WORKDIR /workspace
 
@@ -18,11 +19,14 @@ COPY controllers/ controllers/
 COPY pkg/ pkg/
 COPY internal/ internal/
 
-# build
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o source-controller main.go
+# build without specifing the arch
+RUN CGO_ENABLED=0 go build -a -o source-controller main.go
 
 FROM alpine:3.12
 
+# link repo to the GitHub Container Registry image
+LABEL org.opencontainers.image.source="https://github.com/fluxcd/source-controller"
+
 RUN apk add --no-cache ca-certificates tini
 
 COPY --from=builder /workspace/source-controller /usr/local/bin/