Add condition for windows build

Author: dannawang0221

Makefile

@@ -41,8 +41,10 @@ gce-pd-driver: require-GCE_PD_CSI_STAGING_VERSION
 	go build -mod=vendor -gcflags=$(GCFLAGS) -ldflags "-X main.version=$(STAGINGVERSION)" -o bin/${DRIVERBINARY} ./cmd/gce-pd-csi-driver/
 
 gce-pd-driver-windows: require-GCE_PD_CSI_STAGING_VERSION
+ifeq ($(ARCH), amd64)
 	mkdir -p bin
 	GOOS=windows go build -mod=vendor -ldflags -X=main.version=$(STAGINGVERSION) -o bin/${DRIVERWINDOWSBINARY} ./cmd/gce-pd-csi-driver/
+endif
 
 build-container: require-GCE_PD_CSI_STAGING_IMAGE require-GCE_PD_CSI_STAGING_VERSION init-buildx
 	$(DOCKER) buildx build --platform=linux --progress=plain \