Checks every library using PhoenixMountable.Migrations against the
database, for CI.
$ mix phoenix_mountable.check
Exits with status 1 when a library is not installed or its schema is older
than the library needs. With --strict, a pending upgrade (older than the
latest, but still compatible) fails too.
Options
-r,--repo— the repo (defaults to the app's:ecto_repos)--prefix— the prefix to check--strict— fail on pending upgrades--only— check only this migrations module (can repeat)