Simple CI configuration

.gitlab-ci.yml

+image: node:latest
+    stages:
+      - build
+      - test
+
+    cache:
+      paths:
+        - node_modules/
+
+    install_dependencies:
+      stage: build
+      script:
+        - npm install --global yarn
+        - yarn install
+        - yarn build
+      artifacts:
+        paths:
+          - node_modules/
+
+    testing_testing:
+      stage: test
+      script: yarn test
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