ci: provide lib via artifacts instead of cache

Closes #2

.gitlab-ci.yml

@@ -1,9 +1,8 @@
-image: node:lts-alpine
+image: registry.gitlab.com/openstapps/projectmanagement/node
 
 cache:
   key: ${CI_COMMIT_REF_SLUG}
   paths:
-    - lib
     - node_modules
 
 stages:
@@ -17,6 +16,10 @@ build:build:
   script:
     - npm install
     - npm run build
+  artifacts:
+    paths:
+      - lib
+    expire_in: 1 week
 
 test:audit:
   stage: test