Set up Gitlab CI

.gitlab-ci.yml

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+# Note: We use --silent argument on yarn invocations to keep the output simple
+# and readable through email notifications.
+image: node:8
+
+cache:
+    key: 'node-modules-cyclassist'
+    paths:
+        - node_modules/
+        - yarn.lock
+
+stages:
+    - lint  # Check code syntax and coding style
+    - build  # Try to build Kresus code
+    - test  # Run unit tests
+
+# Lint and check last commit in a dedicated task
+lint:
+    stage: lint
+    before_script:
+        - yarn install
+    script:
+        # Lint JS code
+        - yarn run --silent lint
+
+# Build the server and client code in dev and production
+build:
+    stage: build
+    before_script:
+        - yarn install
+    script:
+        # Check everything builds correctly
+        - yarn run --silent build
+    cache:
+        policy: pull
+
+# Run tests
+test:
+    stage: test
+    before_script:
+        - yarn install
+    script:
+        - yarn run --silent test
+    cache:
+        policy: pull