Remove curly braces from makefile

In gitlab, make is using /bin/sh, which does not accept brace expansion

.makefiles/k8s.mk

@@ -43,7 +43,7 @@ info: ## Print variables. Useful for debugging.
 
 deploy: ## Deploy to kubernetes using the credentials in KUBE_CA_PEM_FILE (or KUBE_CA_BUNDLE ) and TOKEN
 	@ls k8s/
-	@cat k8s/*.{yaml,yml,tmpl} 2>/dev/null | envsubst | $(KUBECTL) apply -f -
+	@cat k8s/*.yaml k8s/*.yml k8s/*.tmpl 2>/dev/null | envsubst | $(KUBECTL) apply -f -
 
 deploy-check: ## Get the deployed configuration.
 	@$(KUBECTL) get deploy,pods,svc,ingress