add make env-snippet

Makefile

 # a helper shell script
-MAKE_VERSION=1.1.3
+MAKE_VERSION=1.1.4
 
 define MAKEFUNCTIONCODE
 	function hasChanges() {
@@ -229,3 +229,11 @@ delete-docker-image:
 # || true to force exoit code to 0 otherwise if no line matched, make will show some error
 list-docker-image:
 	@docker images | grep $(RMI_ARGS) || true
+
+env-snippet:
+	@jq -r '..|select(type=="string") + "="' config/custom-environment-variables.json > _temp_file_.env
+	@keg -s nexpieconfig  _temp_file_.env > /dev/null
+	@cat env-snippet-nexpieconfig.yaml
+	@rm _temp_file_.env
+	@rm nexpieconfig.yaml
+	@rm env-snippet-nexpieconfig.yaml