fix: Fix Kustomize installation (#700)

Signed-off-by: Christopher Pitstick <cpitstick@lat.ai>

Makefile

@@ -214,12 +214,11 @@ KUSTOMIZE_VERSION ?= v5.4.1
 CONTROLLER_TOOLS_VERSION ?= v0.15.0
 CRDOC_VERSION ?= v0.6.2
 
-KUSTOMIZE_INSTALL_SCRIPT ?= "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"
 .PHONY: kustomize
 kustomize: $(KUSTOMIZE) ## Download kustomize locally if necessary.
 $(KUSTOMIZE): $(LOCALBIN)
 	[ -e "$(KUSTOMIZE)" ] && rm -rf "$(KUSTOMIZE)" || true
-	curl -s $(KUSTOMIZE_INSTALL_SCRIPT) | bash -s -- $(subst v,,$(KUSTOMIZE_VERSION)) $(LOCALBIN)
+	test -s ${LOCALBIN}/kustomize || GOBIN=${LOCALBIN} GO111MODULE=on go install sigs.k8s.io/kustomize/kustomize/v5@$(KUSTOMIZE_VERSION)
 
 .PHONY: controller-gen
 controller-gen: $(CONTROLLER_GEN) ## Download controller-gen locally if necessary.