specify platform so containers contains binaries that run on linux amd64 (#291)

Author: Drew Wells

Makefile

@@ -101,7 +101,7 @@ 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: ## Build docker image with the manager.
-	$(CONTAINER_TOOL) build -t ${IMG} .
+	$(CONTAINER_TOOL) build --platform linux/amd64 -t ${IMG} .
 
 .PHONY: docker-push
 docker-push: ## Push docker image with the manager.

Makefile.infoblox

@@ -21,7 +21,9 @@ DSNEXEC_IMG ?= ghcr.io/infobloxopen/db-controller/dsnexec:${GIT_COMMIT}
 
 docker-build-%: target=$(@:docker-build-%=%)
 docker-build-%: .id
-	cd $(target) && $(CONTAINER_TOOL) build -t ghcr.io/infobloxopen/$(target):$(GIT_COMMIT) .
+	cd $(target) && $(CONTAINER_TOOL) build \
+        --platform linux/amd64 \
+        -t ghcr.io/infobloxopen/$(target):$(GIT_COMMIT) .
 
 docker-push-%: target=$(@:docker-push-%=%)
 docker-push-%: .id