Add certs-clean target to Makefile and implement clean functionality in TLS cert generation

Author: pdabelf5

Makefile

@@ -272,3 +272,11 @@ ifeq (, $(shell command -v go))
 else
 	make -C hack/tls-cert-gen run
 endif
+
+.PHONY: certs-clean
+certs-clean: ## Clean just in time TLS certificates needed for tests and examples
+ifeq (, $(shell command -v go))
+	docker run --rm -v .:/workspace/kubernetes-ingress -w /workspace/kubernetes-ingress golang:1.25.4-trixie make certs-clean
+else
+	make -C hack/tls-cert-gen clean
+endif