Merge branch 'revert-618cc488' into 'main'

Revert "Update .gitlab-ci.yml"

See merge request !2

.gitlab-ci.yml

-# The Docker image that will be used to build your app
-image: insu-learn
-# Functions that should be executed before the build script is run
-before_script:
-  - npm install --legacy-peer-deps
+stages:
+  - lint
+
+lint_frontend:
+  stage: lint
+  image: node:lts
+  script:
+    - npm ci --legacy-peer-deps
+    - npm run lint
+  tags:
+    - shared-fi