Add strip to all Makefile variables (#4112)

Removes whitespaces from all variables to avoid issues.

Author: lucacome

Makefile

@@ -11,7 +11,7 @@ override DOCKER_BUILD_OPTIONS += --build-arg IC_VERSION=$(VERSION) ## The option
 ARCH ?= amd64 ## The architecture of the image or binary. For example: amd64, arm64, ppc64le, s390x. Not all architectures are supported for all targets
 
 # final docker build command
-DOCKER_CMD = docker build --platform linux/$(ARCH) $(strip $(DOCKER_BUILD_OPTIONS)) --target $(strip $(TARGET)) -f build/Dockerfile -t $(strip $(PREFIX)):$(strip $(TAG)) .
+DOCKER_CMD = docker build --platform linux/$(strip $(ARCH)) $(strip $(DOCKER_BUILD_OPTIONS)) --target $(strip $(TARGET)) -f build/Dockerfile -t $(strip $(PREFIX)):$(strip $(TAG)) .
 
 export DOCKER_BUILDKIT = 1
 
@@ -75,7 +75,7 @@ build: ## Build Ingress Controller binary
 	@docker -v || (code=$$?; printf "\033[0;31mError\033[0m: there was a problem with Docker\n"; exit $$code)
 ifeq ($(strip $(TARGET)),local)
 	@go version || (code=$$?; printf "\033[0;31mError\033[0m: unable to build locally, try using the parameter TARGET=container or TARGET=download\n"; exit $$code)
-	CGO_ENABLED=0 GOOS=linux GOARCH=$(ARCH) go build -trimpath -ldflags "-s -w -X main.version=${VERSION}" -o nginx-ingress github.com/nginxinc/kubernetes-ingress/cmd/nginx-ingress
+	CGO_ENABLED=0 GOOS=linux GOARCH=$(strip $(ARCH)) go build -trimpath -ldflags "-s -w -X main.version=${VERSION}" -o nginx-ingress github.com/nginxinc/kubernetes-ingress/cmd/nginx-ingress
 else ifeq ($(strip $(TARGET)),download)
 	@$(MAKE) download-binary-docker
 endif
@@ -93,7 +93,7 @@ endif
 .PHONY: build-goreleaser
 build-goreleaser: ## Build Ingress Controller binary using GoReleaser
 	@goreleaser -v || (code=$$?; printf "\033[0;31mError\033[0m: there was a problem with GoReleaser. Follow the docs to install it https://goreleaser.com/install\n"; exit $$code)
-	GOOS=linux GOPATH=$(shell go env GOPATH) GOARCH=$(ARCH) goreleaser build --clean --debug --snapshot --id kubernetes-ingress --single-target
+	GOOS=linux GOPATH=$(shell go env GOPATH) GOARCH=$(strip $(ARCH)) goreleaser build --clean --debug --snapshot --id kubernetes-ingress --single-target
 
 .PHONY: debian-image
 debian-image: build ## Create Docker image for Ingress Controller (Debian)
@@ -152,7 +152,7 @@ all-images: alpine-image alpine-image-plus debian-image debian-image-plus debian
 
 .PHONY: push
 push: ## Docker push to PREFIX and TAG
-	docker push $(PREFIX):$(TAG)
+	docker push $(strip $(PREFIX)):$(strip $(TAG))
 
 .PHONY: clean
 clean:  ## Remove nginx-ingress binary