feat: add multi-arch build for docker image (#233)

Author: s-vitaliy

.github/workflows/action-docker-test.yml

@@ -19,10 +19,17 @@ jobs:
         username: ${{ github.repository_owner }}
         password: ${{ secrets.GITHUB_TOKEN }}
 
+    - name: Set up Docker Buildx
+      uses: docker/[email protected]
+      with:
+        use: true
+        platforms: linux/arm64,linux/amd64
+
     - name: build and push
       uses: docker/build-push-action@v6
       with:
         push: true
+        platforms: linux/arm64,linux/amd64
         build-args: |
           VERSION=dev
         tags: |
@@ -39,6 +46,9 @@ jobs:
     name: test
     runs-on: ubuntu-latest
     needs: build-dev-image
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, ubuntu-24.04-arm ]
 
     steps:
       - name: checkout

.github/workflows/release.yml

@@ -40,12 +40,19 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Set up Docker Buildx
+        uses: docker/[email protected]
+        with:
+          use: true
+          platforms: linux/arm64,linux/amd64
+
       - name: build and push
         uses: docker/build-push-action@v6
         with:
           push: true
           build-args: |
             VERSION=${{ env.RELEASE_VERSION }}
+          platforms: linux/arm64,linux/amd64
           tags: |
             ghcr.io/vladopajic/go-test-coverage:${{ env.RELEASE_VERSION }}
             ghcr.io/vladopajic/go-test-coverage:${{ steps.majorver.outputs.major-tag }}

Dockerfile

@@ -1,5 +1,6 @@
 # GO_VERSION: automatically update to most recent via dependabot
-FROM golang:1.25.3 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.25.3 AS builder
+
 WORKDIR /workspace
 
 COPY go.mod go.mod
@@ -10,10 +11,13 @@ RUN go mod download all
 COPY ./ ./
 
 ARG VERSION
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+ARG TARGETOS 
+ARG TARGETARCH
+
+RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH \
     go build -o go-test-coverage .
 
-FROM gcr.io/distroless/base:latest
+FROM --platform=$BUILDPLATFORM gcr.io/distroless/base:latest
 WORKDIR /
 COPY --from=builder /workspace/go-test-coverage .
 COPY --from=builder /usr/local/go/bin/go /usr/local/go/bin/go