Frontend regression testing with puppeteer

.drone.yml

.gitignore

tests/ui-regression/config.js

tests/ui-regression/helper.js

tests/ui-regression/out/index.html

tests/ui-regression/package.json

tests/ui-regression/runTests.js

tests/ui-regression/test/appsSpec.js

tests/ui-regression/test/filesSpec.js

tests/ui-regression/test/installSpec.js

tests/ui-regression/test/loginSpec.js

tests/ui-regression/test/publicSpec.js

tests/ui-regression/test/settingsSpec.js