Build multiarch Docker image

Author: hzieba

.github/workflows/release.yml

@@ -111,12 +111,19 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build and push Docker image
         id: push
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
 

Dockerfile

@@ -1,4 +1,9 @@
-FROM golang:latest AS builder
+FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:latest AS builder
+
+ARG BUILDPLATFORM
+ARG TARGETPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
 
 ENV GO111MODULE=on \
     CGO_ENABLED=0
@@ -11,19 +16,14 @@ COPY go.sum .
 RUN go mod download
 
 COPY . .
-RUN make build
+RUN OS=${TARGETOS} ARCH=${TARGETARCH} make build
 
 WORKDIR /dist
 
 RUN cp /build/cortex-tenant ./cortex-tenant
-
-RUN ldd cortex-tenant | tr -s '[:blank:]' '\n' | grep '^/' | \
-    xargs -I % sh -c 'mkdir -p $(dirname ./%); cp % ./%;'
-RUN mkdir -p lib64 && cp /lib64/ld-linux-x86-64.so.2 lib64/
-
 RUN mkdir /data && cp /build/deploy/cortex-tenant.yml /data/cortex-tenant.yml
 
-FROM scratch
+FROM --platform=${TARGETPLATFORM:-linux/amd64} scratch
 
 COPY --chown=65534:0 --from=builder /dist /
 

Makefile

@@ -10,13 +10,16 @@ RELEASE := 1
 GO ?= go
 OUT := .out
 
+OS ?= linux
+ARCH ?= amd64
+
 all: rpm deb
 
 build:
-	go test ./... && \
-	GOARCH=amd64 \
-	GOOS=linux \
-	CGO_ENABLED=0 \
+	export GOARCH=$(ARCH)
+	export GOOS=$(OS)
+	export CGO_ENABLED=0
+	go test ./...
 	$(GO) build -ldflags "-s -w -extldflags \"-static\" -X main.Version=$(VERSION)"
 
 prepare:
@@ -52,7 +55,7 @@ build-rpm:
 		--description "$(DESCRIPTION)" \
 		-m "$(MAINTAINER)" \
 		--license "$(LICENSE)" \
-		-a amd64 \
+		-a $(ARCH) \
 		.
 
 build-deb:
@@ -76,5 +79,5 @@ build-deb:
 		--description "$(DESCRIPTION)" \
 		-m "$(MAINTAINER)" \
 		--license "$(LICENSE)" \
-		-a amd64 \
+		-a $(ARCH) \
 		.