added gitlab ci

.gitlab-ci.yml

+stages:
+  - test
+variables:
+ npm_config_cache: "$CI_PROJECT_DIR/.npm"
+ CYPRESS_CACHE_FOLDER: "$CI_PROJECT_DIR/cache/Cypress"
+cache:
+ key: ${CI_COMMIT_REF_SLUG}
+ paths:
+   - .npm
+   - cache/Cypress
+   - node_modules
+test:
+ image: cypress/base:10
+ stage: test
+ script:
+ # install dependencies
+ - npm ci
+ # Kjør express-serveren i bakgrunnen
+ - npm start &
+ # Kjør testene
+ - npm test
+ artifacts:
+   when: always
+   paths:
+    - cypress/videos
+    - cypress/screenshots
+   expire_in: 1 day
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