Add GitLab CI config

.gitlab-ci.yml

@@ -0,0 +1,23 @@
+image: alpine:latest
+
+before_script:
+  - apk add yarn
+  - yarn global add node-gyp
+  - yarn install
+
+cache:
+  paths:
+          - node_modules
+
+test:
+  script:
+    - yarn run test:jest
+
+build:
+  script:
+    - yarn run build
+  artifacts:
+    paths:
+      - public/packs
+      - public/assets
+    expire_in: 1 week