allow migrations through env var

[MarceloRobert]

instead of deciding if we want to always perform migrations or if we want to block them, we could have them be gated by an environment variable, so that we can change the behavior if needed, and especially decide if we want them to run only on production or on staging too

[MarceloRobert]

Moved to Blocked while we organize the separate staging database. If that feature goes through then we won't need this, and in the meantime this could be hurtful to the environment configs