Automatically build Android APK for Ionic 3 project stored in GitLab

Setup GitLab CI. Your configuration file will look something like this

Optionally put a link to file in your README.md that will look like

https://gitlab.com/YOUR_ORGANIZATION_NAME/YOUR_PROJECT_NAME/builds/artifacts/master/raw/platforms/android/build/outputs/apk/android-debug.apk?job=build_android