Use tonistiigi/xx for cross-platform builds

.github/workflows/e2e.yaml

@@ -12,13 +12,30 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+      - name: Setup Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          buildkitd-flags: "--debug"
       - name: Restore Go cache
         uses: actions/cache@v1
         with:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
           restore-keys: |
             ${{ runner.os }}-go-
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-ghcache-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-ghcache-
       - name: Setup Go
         uses: actions/setup-go@v2
         with:
@@ -44,9 +61,18 @@ jobs:
             exit 1
           fi
       - name: Build container image
-        run: make docker-build IMG=test/notification-controller:latest
-        env:
-          KUBEBUILDER_ASSETS: ${{ github.workspace }}/kubebuilder/bin
+        run: |
+          make docker-build IMG=test/notification-controller:latest \
+            BUILD_PLATFORMS=linux/amd64 \
+            BUILD_ARGS="--cache-from=type=local,src=/tmp/.buildx-cache \
+              --cache-to=type=local,dest=/tmp/.buildx-cache-new,mode=max"
+      - # Temp fix
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+        name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
       - name: Load test image
         run: kind load docker-image test/notification-controller:latest
       - name: Install CRDs

Dockerfile

@@ -1,4 +1,13 @@
-FROM golang:1.16-alpine as builder
+ARG XX_VERSION=1.0.0-rc.2
+
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx
+
+FROM --platform=$BUILDPLATFORM golang:1.16-alpine as builder
+
+# Copy the build utilities.
+COPY --from=xx / /
+
+ARG TARGETPLATFORM
 
 WORKDIR /workspace
 
@@ -18,7 +27,8 @@ COPY controllers/ controllers/
 COPY internal/ internal/
 
 # build
-RUN CGO_ENABLED=0 go build -a -o notification-controller main.go
+ENV CGO_ENABLED=0
+RUN xx-go build -a -o notification-controller main.go
 
 FROM alpine:3.13
 

Makefile

@@ -10,6 +10,11 @@ else
 GOBIN=$(shell go env GOBIN)
 endif
 
+# Allows for defining additional Docker buildx arguments, e.g. '--push'.
+BUILD_ARGS ?=
+# Architectures to build images for.
+BUILD_PLATFORMS ?= linux/amd64
+
 all: manager
 
 # Run tests
@@ -81,8 +86,12 @@ generate: controller-gen
 	cd api; $(CONTROLLER_GEN) object:headerFile="../hack/boilerplate.go.txt" paths="./..."
 
 # Build the docker image
-docker-build: test
-	docker build . -t ${IMG}
+docker-build:
+	docker buildx build \
+	--platform=$(BUILD_PLATFORMS) \
+	-t ${IMG} \
+	--load \
+	${BUILD_ARGS} .
 
 # Push the docker image
 docker-push: