Minimal CI to get started

A minimalistic starting point CI that just does a basic build. This should at least ensure that the code in an MR is complete enough to build correctly.

.gitlab-ci.yml

+stages:
+  - build
+
+build:
+  stage: build
+  image: node:18
+  script:
+    - npm install -g @angular/cli
+    # - npm install -g @ionic/cli @angular/cli @capacitor/cli
+    - npm install
+    - npm run build
+    - npm run lint