Update pipeline config to not ignore lint

.gitlab-ci.yml

 # The Docker image that will be used to build your app
-image: node:lts
+image: node:latest
+
+stages:
+  - test
+  - pages
+
 # Functions that should be executed before the build script is run
 before_script:
-  - npm ci
+  - npm install
   - mkdir public
+
+lint-test-job:
+  stage: test
+  script:
+    - npm run lint
+
 pages:
+  stage: pages
   script:
     - npm run docs:build
     - mv docs/.vuepress/dist/* public