Add multi arch support

.github/workflows/release.yaml

@@ -11,13 +11,18 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+
       - name: Build
         run: |
-          go build -o prometheus-msk-discovery-linux-amd64
+          GOOS=linux GOARCH=amd64 go build -o prometheus-msk-discovery-linux-amd64
+          GOOS=linux GOARCH=arm64 go build -o prometheus-msk-discovery-linux-arm64
+
       - name: Release
         uses: softprops/action-gh-release@v1
         if: startsWith(github.ref, 'refs/tags/')
         with:
-          files: "prometheus-msk-discovery-linux-amd64"
+          files: |
+            prometheus-msk-discovery-linux-amd64
+            prometheus-msk-discovery-linux-arm64
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Dockerfile

@@ -1,10 +1,12 @@
-FROM golang:1.23-alpine
+FROM golang:1.23-alpine AS builder
+ARG TARGETOS
+ARG TARGETARCH
 WORKDIR /src
 RUN apk --no-cache add git
 COPY main.go go.mod go.sum ./
-RUN CGO_ENABLED=0 GOOS=linux go build -o /bin/prometheus-msk-discovery .
+RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -o /bin/prometheus-msk-discovery .
 
 FROM alpine:latest
 RUN apk --no-cache add ca-certificates
-COPY --from=0 /bin/prometheus-msk-discovery /bin/
+COPY --from=builder /bin/prometheus-msk-discovery /bin/
 ENTRYPOINT ["prometheus-msk-discovery"]