feat: add initial support for multi architecture builds

Dockerfile

@@ -1,13 +1,17 @@
-FROM golang:1.22-alpine AS builder
+FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.22-alpine AS builder
+
+ARG BUILDPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
+
 RUN apk --no-cache add ca-certificates make
 WORKDIR /app
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN make build
-
+RUN make build TARGETOS=${TARGETOS} TARGETARCH=${TARGETARCH}
 
-FROM scratch
+FROM --platform=${BUILDPLATFORM:-linux/amd64} scratch
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 WORKDIR /root/
 COPY --from=builder /app/bin .

Makefile

@@ -1,39 +1,86 @@
-VERSION ?= v0.0.1
-REGISTRY ?= ghcr.io
+# Variables that are used in `defined<>endef` blocks need to be exported
+export VERSION ?= v0.0.1
+export REGISTRY ?= ghcr.io
 IMAGE_BUILDER ?= docker
-IMAGE_BUILD_CMD ?= build
-IMAGE_NAME ?= woehrl01/pod-pacemaker
+IMAGE_BUILD_CMD ?= buildx build
+export IMAGE_NAME ?= woehrl01/pod-pacemaker
 
 export IMG = $(REGISTRY)/$(IMAGE_NAME):$(VERSION)
 export CGO_ENABLED=0
 export GOOS=linux
 
 .PHONY: proto
+.ONESHELL:
+
+define kind_load =
+	# The architecture to load depends on the current environment (gitlab runner/workstation)
+	arch=$(uname -m)
+	case ${arch} in
+		x86_64)
+			kind load docker-image ${IMG}-amd64
+		;;
+		aarch64)
+			kind load docker-image ${IMG}-arm64
+		;;
+		*)
+			echo "Architecture ${arch} not supported"
+			exit 1
+		;;
+	esac
+endef
+
+define kind_deploy =
+	# The architecture to load depends on the current environment (gitlab runner/workstation)
+	arch=$(uname -m)
+	case ${arch} in
+		x86_64)
+			tag=${VERSION}-amd64
+		;;
+		aarch64)
+			tag=${VERSION}-arm64
+		;;
+		*)
+			echo "Architecture ${arch} not supported"
+			exit 1
+		;;
+	esac
+	helm upgrade --install pod-pacemaker charts/pod-pacemaker \
+		--set image.repository=${REGISTRY}/${IMAGE_NAME} \
+		--set image.tag=${tag} \
+		--set debugLogging=true \
+		--set defaultThrottleConfig.config.maxConcurrent.value=1
+endef
+
+.SILENT: kind-deploy kind-load
 
 proto:
 	protoc --go_out=. --go_opt=paths=source_relative \
        --go-grpc_out=. --go-grpc_opt=paths=source_relative \
        proto/pod_limiter.proto
 
 cni:
-	cd cmd/cni-plugin && go build -o ../../bin/cni-plugin
+	cd cmd/cni-plugin && CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o ../../bin/cni-plugin
 
 make-init:
-	cd cmd/init && go build -o ../../bin/cni-init
+	cd cmd/init && CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o ../../bin/cni-init
 
 daemonset:
-	cd cmd/node-daemon && go build -o ../../bin/node-daemon
+	cd cmd/node-daemon && CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o ../../bin/node-daemon
 
 build: cni make-init daemonset
 
 clean:
 	rm -rf bin/*
 
 docker-build:
-	$(IMAGE_BUILDER) $(IMAGE_BUILD_CMD) -t $(IMG) .
+	# Build each supported architecture and load the resulting image into docker for use with kind
+	docker buildx create --use
+	$(IMAGE_BUILDER) $(IMAGE_BUILD_CMD) --load --platform linux/amd64 --tag $(IMG)-amd64 . 
+	$(IMAGE_BUILDER) $(IMAGE_BUILD_CMD) --load --platform linux/arm64/v8 --tag $(IMG)-arm64 .
 
 docker-push:
-	$(IMAGE_BUILDER) push $(IMG)
+	# Build (again) for all supported architectures and pushlish the result
+	$(IMAGE_BUILDER) $(IMAGE_BUILD_CMD) --push --platform linux/arm64/v8,linux/amd64 --tag $(IMG) .
 
 helm-render:
 	helm template charts/pod-pacemaker --set image.repository=$(REGISTRY)/$(IMAGE_NAME) --set image.tag=$(VERSION)
@@ -45,9 +92,7 @@ helm-push:
 	helm package charts/pod-pacemaker --app-version $(VERSION) --version $(VERSION)
 	helm push pod-pacemaker-*.tgz oci://ghcr.io/woehrl01/pod-pacemaker
 
-kind-load:
-	kind load docker-image $(IMG)
+kind-load: ; $(value kind_load)
 
-kind-deploy:
-	helm install pod-pacemaker charts/pod-pacemaker --set image.repository=$(REGISTRY)/$(IMAGE_NAME) --set image.tag=$(VERSION) --set debugLogging=true --set defaultThrottleConfig.config.maxConcurrent.value=1
+kind-deploy: ; $(value kind_deploy)