fix: Build in docker, improve multiarch

.github/workflows/image.yml

@@ -18,30 +18,14 @@ jobs:
     strategy:
       matrix:
         go_version: [1.21]
-        os: [linux ]
-        arch: [amd64, arm64]
-        include:
-          - os: linux
-            arch: amd64
-            goos: linux
-            goarch: amd64
-          - os: linux
-            arch: arm64
-            goos: linux
-            goarch: arm64
+        os: [linux]
+        platform:
+          - linux/amd64
+          - linux/arm64
     steps:
-      - name: Set up Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: ${{ matrix.go_version }}
-
       - name: Check out code
         uses: actions/checkout@v2
 
-      - name: Build
-        run: |
-          env GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go build -v -o helmfile-nix
-
       - name: Log in to the Container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
         with:
@@ -59,6 +43,7 @@ jobs:
         with:
           context: .
           push: true
+          platforms: ${{ matrix.platform }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
       - name: Generate artifact attestation

Dockerfile

@@ -1,8 +1,24 @@
-FROM nixos/nix:2.22.0 AS nix
+FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.22.1-bullseye as builder
+
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
+
+WORKDIR /app/
+ADD . .
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -ldflags="-w -s" -o helmfile-nix .
+
+
+# Build the binary.
+RUN go build -mod=readonly -v -o helmfile-nix .
+
+
+FROM --platform=${BUILDPLATFORM:-linux/amd64} nixos/nix:2.22.0 AS nix
 
 RUN nix build --extra-experimental-features nix-command --extra-experimental-features flakes nixpkgs#nixStatic
 
-FROM alpine:3.19@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
+FROM --platform=${BUILDPLATFORM:-linux/amd64} alpine:3.19@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
 
 
 # renovate: datasource=github-releases depName=helmfile/helmfile
@@ -16,21 +32,23 @@ ARG KUSTOMIZE_VERSION=5.3.0
 
 COPY --from=nix ./result/ /
 
-ADD helmfile-nix /usr/local/bin/helmfile-nix
+COPY --from=builder /app/helmfile-nix /usr/local/bin/helmfile-nix
 
 ENV INSTALL_PATH=/usr/local/bin
 
+RUN "Building for ${TARGETOS}-${TARGETARCH}"
+
 RUN apk add --update --no-cache bash curl git yq && \
   chmod +x ${INSTALL_PATH}/helmfile-nix && \
   # helmfile
   HELMFILE_STRIPPED=$(echo "$HELMFILE_VERSION" | cut -c2-) && \
   export HELMFILE_STRIPPED && \
-  curl -sSL "https://github.com/helmfile/helmfile/releases/download/${HELMFILE_VERSION}/helmfile_${HELMFILE_STRIPPED}_linux_amd64.tar.gz" | tar -zx -C ${INSTALL_PATH} -f - helmfile && \
+  curl -sSL "https://github.com/helmfile/helmfile/releases/download/${HELMFILE_VERSION}/helmfile_${HELMFILE_STRIPPED}_linux_${TARGETARCH}.tar.gz" | tar -zx -C ${INSTALL_PATH} -f - helmfile && \
   chmod +x ${INSTALL_PATH}/helmfile && \
   # Install kustomize
-  curl -sSL "https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${KUSTOMIZE_VERSION}/kustomize_v${KUSTOMIZE_VERSION}_linux_amd64.tar.gz" | tar -zx -C ${INSTALL_PATH} -f - && \
+  curl -sSL "https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${KUSTOMIZE_VERSION}/kustomize_v${KUSTOMIZE_VERSION}_linux_${TARGETARCH}.tar.gz" | tar -zx -C ${INSTALL_PATH} -f - && \
   # Install helm and friends
-  curl -sSL "https://get.helm.sh/helm-${HELM_VERSION}-linux-amd64.tar.gz" | tar -zx --strip-components=1 -C ${INSTALL_PATH} -f - linux-amd64/helm && \
+  curl -sSL "https://get.helm.sh/helm-${HELM_VERSION}-linux-${TARGETARCH}.tar.gz" | tar -zx --strip-components=1 -C ${INSTALL_PATH} -f - linux-${TARGETARCH}/helm && \
   helm plugin install https://github.com/databus23/helm-diff --version ${HELM_DIFF_VERSION}
 
 VOLUME /nix

shell.nix

@@ -19,6 +19,7 @@ pkgs.mkShell {
   packages = [
     goEnv
     gomod2nix
+    pkgs.docker
     pkgs.helmfile
     pkgs.kubernetes-helm
   ];