added package-lock.json and using it as key to cache

.gitignore

@@ -9,5 +9,4 @@
 Homestead.json
 Homestead.yaml
 npm-debug.log
-yarn-error.log
-package-lock.json
\ No newline at end of file
+yarn-error.log
\ No newline at end of file

.gitlab-ci.yml

@@ -42,8 +42,7 @@ prepare_node:
   variables:
     npm_config_cache: "$CI_PROJECT_DIR/.npm"
   before_script:
-    - npm install -g npm-cache
-    - npm-cache install --cacheDirectory "$CI_PROJECT_DIR/.npm-package-cache" npm
+    - npm ci --cache .npm --prefer-offline
   script:
     - npm run prod
   artifacts:
@@ -53,10 +52,11 @@ prepare_node:
       - public/mix-manifest.json
   cache:
     # Cache per Branch
-    key: "proxy-$CI_COMMIT_REF_SLUG"
+    key:
+      files:
+        package-lock.json
     paths:
       - .npm
-      - .npm-package-cache
       - node_modules
   only:
     - branches