Fixes #2319: Compile UI tests (only flavor that runs in automation) for every pull request.
Fixes #2319: Compile UI tests (only flavor that runs in automation) for every pull request.

ekager/focus-android,liuche/focus-android,mozilla-mobile/focus-android,mozilla-mobile/focus-android,ekager/focus-android,jonalmeida/focus-android,mozilla-mobile/focus-android,jonalmeida/focus-android,liuche/focus-android,jonalmeida/focus-android,mozilla-mobile/focus-android,ekager/focus-android,mozilla-mobile/focus-android,jonalmeida/focus-android,jonalmeida/focus-android,ekager/focus-android,liuche/focus-android,liuche/focus-android,liuche/focus-android,ekager/focus-android,mozilla-mobile/focus-android,liuche/focus-android,ekager/focus-android,jonalmeida/focus-android