Merge branch 'gitlab-ci' into 'master'

Add GitLab CI configuration

See merge request timvisee/send!1

.gitlab-ci.yml

@@ -0,0 +1,23 @@
+image: "node:12-slim"
+
+stages:
+  - test
+
+before_script:
+  # Install dependencies
+  - apt-get update
+  - apt-get install -y git python3 build-essential libxtst6
+
+  # Prepare Chrome for puppeteer
+  - apt-get install -y wget gnupg
+  - wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
+  - sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
+  - apt-get update
+  - apt-get install -y google-chrome-stable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf libxss1 --no-install-recommends
+
+test:
+  stage: test
+  script:
+    - npm ci
+    - npm run lint
+    - npm test