Init gitlab ci

- don't ignore package-lock.json as its needed for test (via npm ci)
- added jest-junit for proper gitlab integration

.gitignore

@@ -5,4 +5,3 @@
 /node_modules
 /umd
 npm-debug.log*
-package-lock.json

.gitlab-ci.yml

+upstream_tests:
+  image: docker.io/node:current
+  before_script:
+    - npm ci
+  script:
+    - npm run test:ci
+  artifacts:
+    when: always
+    paths:
+      - junit.xml
+    reports:
+      junit: junit.xml
+
+

package.json

@@ -18,7 +18,8 @@
     "start": "nwb serve-react-demo",
     "test": "npm run lint && jest",
     "test:coverage": "jest --coverage",
-    "test:watch": "jest --watch"
+    "test:watch": "jest --watch",
+    "test:ci": "jest --ci --reporters=default --reporters=jest-junit --watchAll=false"
   },
   "dependencies": {
     "@psychobolt/react-paperjs": "< 1.0",
@@ -61,6 +62,7 @@
     "eslint-plugin-react": "^7.20.3",
     "jest": "^26.1.0",
     "jest-canvas-mock": "^2.2.0",
+    "jest-junit": "^15.0.0",
     "jest-localstorage-mock": "^2.4.2",
     "mirador": "^3.0.0-rc.5",
     "nwb": "^0.24.7",