chore: add arch configuration for docker-build make target (#117)

* Update Makefile

* fix: specify targetarch for all stages in Dockerfile; use GOARCH

Signed-off-by: Tyler Gillson <tyler.gillson@gmail.com>

---------

Signed-off-by: Tyler Gillson <tyler.gillson@gmail.com>
Co-authored-by: Tyler Gillson <tyler.gillson@gmail.com>

Author: wcrum

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 AS builder
+FROM --platform=$TARGETPLATFORM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 
@@ -25,7 +25,7 @@ RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o ma
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details
-FROM gcr.io/distroless/static:nonroot AS production
+FROM --platform=$TARGETPLATFORM gcr.io/distroless/static:nonroot AS production
 WORKDIR /
 COPY --from=builder /workspace/manager .
 USER 65532:65532

Makefile

@@ -2,6 +2,8 @@
 # Image URL to use all building/pushing image targets
 IMG ?= quay.io/spectrocloud-labs/validator-plugin-aws:latest
 
+GOARCH ?= $(shell go env GOARCH)
+
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
 ifeq (,$(shell go env GOBIN))
 GOBIN=$(shell go env GOPATH)/bin
@@ -77,7 +79,7 @@ run: manifests generate fmt vet ## Run a controller from your host.
 # More info: https://docs.docker.com/develop/develop-images/build_enhancements/
 .PHONY: docker-build
 docker-build: test ## Build docker image with the manager.
-	$(CONTAINER_TOOL) build -t ${IMG} .
+	$(CONTAINER_TOOL) build -t ${IMG} . --platform linux/$(GOARCH)
 
 .PHONY: docker-push
 docker-push: ## Push docker image with the manager.