Focus Android test builds: moving to Google Play

Bonjour localizers !

Focus for Android testing is moving away from Taskcluster and coming to
Google Play in the form of Nightlies.

To have access to these, the mobile team will have to whitelist localizers'
Google account first. Many of you have in the past communicated those when
we were using the (even more) previous BuddyBuilds - but in the meantime,
more people have joined, and some of you I will have to contact directly in
order to update the email.

Anyways, please reach out to me directly (don't reply to the list here) if
you haven't sent me your Google account info in the past, and I'll make
sure you are good to go.

Thanks everyone!

cheers
-- 
Delphine