Use tonistiigi/xx for cross-platform builds

.github/workflows/e2e.yaml

@@ -12,6 +12,15 @@ 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:
@@ -44,7 +53,7 @@ jobs:
             exit 1
           fi
       - name: Build container image
-        run: make docker-build IMG=test/kustomize-controller:latest
+        run: make docker-build IMG=test/kustomize-controller:latest BUILD_PLATFORMS=linux/amd64 BUILD_ARGS=--load
       - name: Load test image
         run: kind load docker-image test/kustomize-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 kustomize-controller main.go
+ENV CGO_ENABLED=0
+RUN xx-go build -a -o kustomize-controller main.go
 
 FROM alpine:3.14
 

Makefile

@@ -11,6 +11,11 @@ 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,linux/arm64,linux/arm/v7
+
 all: manager
 
 # Download the envtest binaries to testbin
@@ -94,7 +99,10 @@ generate: controller-gen
 
 # Build the docker image
 docker-build:
-	docker build . -t ${IMG}
+	docker buildx build \
+	--platform=$(BUILD_PLATFORMS) \
+	-t ${IMG} \
+	${BUILD_ARGS} .
 
 # Push the docker image
 docker-push: