feat: Add support for ARM64 arch (#22)

Author: Jorge Turrado Ferrero

.github/workflows/pull_request_docker.yml

@@ -13,7 +13,7 @@ jobs:
         id: filter
         with:
           filters: |
-            dockerfiles:
+            dockerfile:
               - 'Dockerfile*'
 
       - name: Build images
@@ -58,12 +58,14 @@ jobs:
     name: Validate dev-container
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v3
+
       - uses: dorny/paths-filter@v2
         id: filter
         with:
           filters: |
             dockerfile:
-              - 'Dockerfile*'
+              - '.devcontainer/**'
 
       - name: Build images
         if: steps.filter.outputs.dockerfile == 'true'

.github/workflows/release.yaml

@@ -44,6 +44,9 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
       - name: Build and push Docker image
         run: make publish
         env:

Dockerfile

@@ -1,11 +1,14 @@
-FROM golang:1.17-alpine3.14 as builder
+FROM --platform=$BUILDPLATFORM golang:1.17-alpine3.14 as builder
 RUN apk --no-cache add git
 WORKDIR /go/src/build
 COPY . .
-RUN export CGO_ENABLED=0 \
-    && mkdir -p dist \
+
+# https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/
+ARG TARGETOS
+ARG TARGETARCH
+RUN mkdir -p dist \
     && go mod vendor \
-    && go build -o dist/helm-repo-updater .
+    && CGO_ENABLED=0 GOOS=$(TARGET_OS) GOARCH=$(ARCH) go build -o dist/helm-repo-updater .
 
 FROM alpine:3.14
 ENV SSH_KNOWN_HOSTS="~/.ssh/known_hosts"

Makefile

@@ -77,12 +77,11 @@ gofumpt: $(GOBIN_TOOL)
 
 .PHONY: docker-build
 docker-build: ## Build main image
-	docker build -f Dockerfile -t $(IMAGE) -t $(IMAGE_LATEST) .
+	DOCKER_BUILDKIT=1 docker build -f Dockerfile -t $(IMAGE) -t $(IMAGE_LATEST) .
 
 .PHONY: publish
 publish: docker-build ## Publish main image
-	docker push $(IMAGE)
-	docker push $(IMAGE_LATEST)
+	docker buildx build --push --platform=linux/amd64,linux/arm64 . -t $(IMAGE) -t $(IMAGE_LATEST)
 
 .PHONY: docker-dev-container
 docker-dev-container: ## Build devcontainer image