[Golang] Remove go get (ray-project#1283)

ray-operator/Makefile

@@ -110,26 +110,13 @@ undeploy: ## Undeploy controller from the K8s cluster specified in ~/.kube/confi
 
 CONTROLLER_GEN = $(shell pwd)/bin/controller-gen
 controller-gen: ## Download controller-gen locally if necessary.
-	$(call go-get-tool,$(CONTROLLER_GEN),sigs.k8s.io/controller-tools/cmd/[email protected])
+	test -s $(CONTROLLER_GEN) || GOBIN=$(CONTROLLER_GEN)/.. go install sigs.k8s.io/controller-tools/cmd/[email protected]
 
 KUSTOMIZE = $(shell pwd)/bin/kustomize
 kustomize: ## Download kustomize locally if necessary.
-	$(call go-get-tool,$(KUSTOMIZE),sigs.k8s.io/kustomize/kustomize/v3@v3.8.7)
+	test -s $(KUSTOMIZE) ||  GOBIN=$(KUSTOMIZE)/.. go install sigs.k8s.io/kustomize/kustomize/v3@v3.10.0
 
 GOFUMPT = $(shell pwd)/bin/gofumpt
 gofumpt: ## Download gofumpt locally if necessary.
-	$(call go-get-tool,$(GOFUMPT),mvdan.cc/gofumpt@latest)
-
-# go-get-tool will 'go get' any package $2 and install it to $1.
-PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
-define go-get-tool
-@[ -f $(1) ] || { \
-set -e ;\
-TMP_DIR=$$(mktemp -d) ;\
-cd $$TMP_DIR ;\
-go mod init tmp ;\
-echo "Downloading $(2)" ;\
-GOBIN=$(PROJECT_DIR)/bin go get $(2) ;\
-rm -rf $$TMP_DIR ;\
-}
-endef
+	test -s $(GOFUMPT) || GOBIN=$(GOFUMPT)/.. go install mvdan.cc/gofumpt@latest
+