Use docker in case go is not available

Author: javorszky

Makefile

@@ -267,4 +267,8 @@ update-crd-docs: ## Update CRD markdown documentation from YAML definitions
 
 .PHONY: certs
 certs: ## Create 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
+else
 	make -C hack/tls-cert-gen run
+endif