Add support for firebase test lab

[vincentbrison]

No description provided.

[sjcqs]

Would you have more info to what need to be done ?

[sjcqs]

Isn't it supposed to be the responsibility of the consumer ?

[vincentbrison]

To run firebase test lab from CLI, we need to have gcloud sdk installed to be able to authenticate the runner on firebase. Currently Firebase test lab plugins for Fastlane can not overcome this:

• https://github.com/pink-room/fastlane-plugin-run_tests_firebase_testlab
• https://github.com/fastlane/fastlane-plugin-firebase_test_lab

Both plugins need gcloud on the host machine.

CircleCi Dockerfile has the gcloud sdk installed (debian image) -> https://hub.docker.com/r/circleci/android/dockerfile
This image has it too (openjdk image) -> https://hub.docker.com/r/keyopstech/gitlab-android/dockerfile

Additionally we should add instrumented test to the test app, and add the projet to a Firebase project (not sure who should be the owner, Fabernovel?). The gcloud auth token could be stored in Github project secrets.

To avoid to have multiple test projects we might reconsider to use only one test project with module specific to tested feature like ndk, if possible (#16).