Add arm64 support

Signed-off-by: Lee Ween Jiann <16207788+lwj5@users.noreply.github.com>

.github/workflows/publish.yaml

@@ -30,10 +30,12 @@ jobs:
           path: ~/.cache/go-build
           key: ${{ runner.os }}-go-build-v1-${{ github.run_id }}
 
-      - name: Build operator and Tag Latest
-        run: make docker-build
-        env:
-          IMG: ${{ env.REGISTRY_URL }}/${{ env.ORG }}/${{ env.REPO }}:latest
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to Registry
         uses: docker/login-action@v3
@@ -42,7 +44,12 @@ jobs:
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
-      - name: Push latest operator
-        run: make docker-push
-        env:
-          IMG: ${{ env.REGISTRY_URL }}/${{ env.ORG }}/${{ env.REPO }}:latest
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ env.REGISTRY_URL }}/${{ env.ORG }}/${{ env.REPO }}:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -1,5 +1,7 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21 as builder
+
+ARG TARGETOS TARGETARCH
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -18,7 +20,7 @@ COPY version/ version/
 
 # Build
 ARG LD_FLAGS
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="$LD_FLAGS" -a -o manager main.go
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -ldflags="$LD_FLAGS" -a -o manager main.go
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details