fix makefile targets

This would create several targets which didn't incorporate any version
numbers and so wouldn't be updated when version numbers were changed.

There were also non-make-ey ways of doings things like variables and
folder creation.

This also bumps the version of the kubebuilder tools we use

Signed-off-by: Ashley Davis <ashley.davis@venafi.com>

Author: SgtCoDFish

Makefile

@@ -7,36 +7,39 @@ IMAGE_TAG := "latest"
 
 OUT := $(shell pwd)/_out
 
-KUBE_VERSION=1.25.0
+KUBEBUILDER_VERSION=1.28.0
 
-$(shell mkdir -p "$(OUT)")
-export TEST_ASSET_ETCD=_test/kubebuilder/etcd
-export TEST_ASSET_KUBE_APISERVER=_test/kubebuilder/kube-apiserver
-export TEST_ASSET_KUBECTL=_test/kubebuilder/kubectl
+HELM_FILES := $(shell find deploy/example-webhook)
 
-test: _test/kubebuilder
+test: _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/etcd _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/kube-apiserver _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/kubectl
+	TEST_ASSET_ETCD=_test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/etcd \
+	TEST_ASSET_KUBE_APISERVER=_test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/kube-apiserver \
+	TEST_ASSET_KUBECTL=_test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/kubectl \
 	$(GO) test -v .
 
-_test/kubebuilder:
-	curl -fsSL https://go.kubebuilder.io/test-tools/$(KUBE_VERSION)/$(OS)/$(ARCH) -o kubebuilder-tools.tar.gz
-	mkdir -p _test/kubebuilder
-	tar -xvf kubebuilder-tools.tar.gz
-	mv kubebuilder/bin/* _test/kubebuilder/
-	rm kubebuilder-tools.tar.gz
-	rm -R kubebuilder
+_test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH).tar.gz: | _test
+	curl -fsSL https://go.kubebuilder.io/test-tools/$(KUBEBUILDER_VERSION)/$(OS)/$(ARCH) -o $@
 
-clean: clean-kubebuilder
+_test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/etcd _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/kube-apiserver _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)/kubectl: _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH).tar.gz | _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH)
+	tar xfO $< kubebuilder/bin/$(notdir $@) > $@ && chmod +x $@
 
-clean-kubebuilder:
-	rm -Rf _test/kubebuilder
+.PHONY: clean
+clean:
+	rm -r _test $(OUT)
 
+.PHONY: build
 build:
 	docker build -t "$(IMAGE_NAME):$(IMAGE_TAG)" .
 
 .PHONY: rendered-manifest.yaml
-rendered-manifest.yaml:
+rendered-manifest.yaml: $(OUT)/rendered-manifest.yaml
+
+$(OUT)/rendered-manifest.yaml: $(HELM_FILES) | $(OUT)
 	helm template \
 	    --name example-webhook \
             --set image.repository=$(IMAGE_NAME) \
             --set image.tag=$(IMAGE_TAG) \
-            deploy/example-webhook > "$(OUT)/rendered-manifest.yaml"
+            deploy/example-webhook > $@
+
+_test $(OUT) _test/kubebuilder-$(KUBEBUILDER_VERSION)-$(OS)-$(ARCH):
+	mkdir -p $@