Update test env Kube to lowest supported (#79)

Author: mhmxs

Makefile

@@ -24,6 +24,10 @@ else
 GOBIN=$(shell go env GOBIN)
 endif
 
+# KUBEBUILDER_ASSETS path is set as environment variable when running envtest.
+ENVTEST_BIN_VERSION = 1.21.4
+KUBEBUILDER_ASSETS = $(shell $(SETUP_ENVTEST) use -i -p path $(ENVTEST_BIN_VERSION))
+
 # Setting SHELL to bash allows bash commands to be executed by recipes.
 # This is a requirement for 'setup-envtest.sh' in the test target.
 # Options are set to exit when a recipe line exits non-zero or a piped command fails.
@@ -65,11 +69,9 @@ fmt: ## Run go fmt against code.
 vet: ## Run go vet against code.
 	go vet ./...
 
-ENVTEST_ASSETS_DIR=$(shell pwd)/testbin
-test: manifests generate fmt vet ## Run tests.
-	mkdir -p ${ENVTEST_ASSETS_DIR}
-	test -f ${ENVTEST_ASSETS_DIR}/setup-envtest.sh || curl -sSLo ${ENVTEST_ASSETS_DIR}/setup-envtest.sh https://raw.githubusercontent.com/kubernetes-sigs/controller-runtime/v0.8.3/hack/setup-envtest.sh
-	source ${ENVTEST_ASSETS_DIR}/setup-envtest.sh; fetch_envtest_tools $(ENVTEST_ASSETS_DIR); setup_envtest_env $(ENVTEST_ASSETS_DIR); go test ./... -coverprofile cover.out
+test: manifests generate fmt vet setup-envtest ## Run tests.
+	KUBEBUILDER_ASSETS=$(KUBEBUILDER_ASSETS) \
+		go test ./... -coverprofile cover.out
 
 update-kind-nodes:
 ifndef LATEST_KIND_NODE
@@ -120,7 +122,11 @@ deploy: manifests kustomize ## Deploy controller to the K8s cluster specified in
 undeploy: ## Undeploy controller from the K8s cluster specified in ~/.kube/config.
 	$(KUSTOMIZE) build config/default | kubectl delete -f -
 
-
+SETUP_ENVTEST = $(shell pwd)/bin/setup-envtest
+setup-envtest:
+	$(call go-get-tool,$(SETUP_ENVTEST),sigs.k8s.io/controller-runtime/tools/setup-envtest@latest)
+	$(SETUP_ENVTEST) use $(ENVTEST_BIN_VERSION)
+	
 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/controller-gen@v0.9.0)