make multiarch images

Author: byxorna

.github/workflows/docker.yml

@@ -62,6 +62,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,9 +1,12 @@
-FROM golang:1.26 AS build
+FROM --platform=$BUILDPLATFORM golang:1.26 AS build
+
+ARG TARGETOS
+ARG TARGETARCH
 
 WORKDIR /go/src/app
 COPY . .
 
-RUN make
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH make
 
 FROM debian:bookworm-slim
 

Makefile

@@ -13,7 +13,7 @@ clean:
 	rm bin/site || :
 
 build:
-	go build -o bin/$(NAME) \
+	CGO_ENABLED=0 go build -o bin/$(NAME) \
 		-ldflags "-X '$(pkg)/pkg/version.Commit=$(git_commit)' -X '$(pkg)/pkg/version.Date=$(date)' -X '$(pkg)/pkg/version.Version=$(git_tag)'" \
 		$(PACKAGE)/cmd
 
@@ -24,7 +24,7 @@ dev: build
 	@bin/site
 
 docker:
-	docker build -t byxorna/site:$(git_tag) .
+	docker buildx build --platform linux/amd64,linux/arm64 -t byxorna/site:$(git_tag) .
 
 pprof-heap: build
 	go tool pprof http://localhost:6060/debug/pprof/heap