Limit `rails_12factor` to production
Limit `rails_12factor` to production

Using `rails_12factor` in development and test mode adds a bunch of
extra output that's not needed.

bjmllr/habitat_humanity,rubyforgood/habitat_humanity,bjmllr/habitat_humanity,rubyforgood/habitat_humanity,bjmllr/habitat_humanity,rubyforgood/habitat_humanity