Eric Cestari

Results 2 issues of Eric Cestari

From table 9 in [FCM manual](https://firebase.google.com/docs/cloud-messaging/http-server-ref#downstream): > The server couldn't process the request in time. Retry the same request, but you must: > > - Honor the Retry-After header if...

This PR hopefully works. I use a `docker` MIX_ENV and release env, different from the `prod` env.