feat: linux/arm64 compatibility

Fixes: cert-manager#283

Signed-off-by: Robin Breathe <[email protected]>

.github/workflows/on-push-to-main-branch.yml

@@ -43,6 +43,7 @@ jobs:
         build-args: |
           pkg_version=${{ env.PLUGIN_VERSION }}
         context: .
+        platforms: linux/amd64,linux/arm64
         tags: |
           ${{ env.TAG_BASE }}:latest
           ${{ env.TAG_BASE }}:${{ env.PLUGIN_VERSION }}

.github/workflows/on-release.yml

@@ -44,6 +44,7 @@ jobs:
           build-args: |
             pkg_version=${{ steps.tag.outputs.tag }}
           context: .
+          platforms: linux/amd64,linux/arm64
           tags: |
             ${{ env.TAG_BASE }}:latest
             ${{ env.TAG_BASE }}:${{steps.tag.outputs.tag}}

Dockerfile

@@ -2,8 +2,8 @@
 FROM golang:1.21 as builder
 WORKDIR /workspace
 
-ARG TARGETARCH=amd64
-ARG TARGETOS=linux
+ARG TARGETARCH
+ARG TARGETOS
 
 ENV GOPROXY=direct
 # Copy the Go Modules manifests
@@ -18,8 +18,8 @@ COPY main.go main.go
 COPY pkg/ pkg/
 
 ENV CGO_ENABLED=0
-ENV GOOS=$TARGETOS
-ENV GOARCH=$TARGETARCH
+ENV GOOS=${TARGETOS:-linux}
+ENV GOARCH=${TARGETARCH:-amd64}
 ENV GO111MODULE=on
 
 # Do an initial compilation before setting the version so that there is less to

Makefile

@@ -151,6 +151,17 @@ docker-build: test
 docker-push:
 	docker push ${IMG}
 
+PLATFORMS ?= linux/arm64,linux/amd64
+.PHONY: docker-buildx
+docker-buildx: ## Build docker image for the manager with cross-platform support
+	# copy existing Dockerfile and insert --platform=${BUILDPLATFORM} into Dockerfile.cross, and preserve the original Dockerfile
+	sed -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross
+	- docker buildx create --name project-v3-builder
+	docker buildx use project-v3-builder
+	- docker buildx build --push --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile.cross .
+	- docker buildx rm project-v3-builder
+	rm Dockerfile.cross
+
 CONTROLLER_GEN = $(shell pwd)/bin/controller-gen
 controller-gen:
 	$(call go-install-tool,$(CONTROLLER_GEN),sigs.k8s.io/controller-tools/cmd/[email protected])