[ci/cd] use node lts image

.gitlab-ci.yml

@@ -23,7 +23,7 @@ php-syntax-check:
 
 js-syntax-check:
   stage: test
-  image: node:current
+  image: node:lts
   script:
    - npm install -g jshint        
    - find htdocs/js/ -name *.js ! -name jquery* | xargs -n 1 jshint --verbose