This commit changes the credentials commands (e.g. `bin/rails
credentials:edit`) to load `config/environments/#{Rails.env}.rb`.  Thus,
`config.credentials.content_path` and `config.credentials.key_path` can
be set in `config/environments/*.rb`, in addition to the currently
supported `config/application.rb`.

The `load_environment_config` initializer, which is run via
`Rails.application.initialize!`, is responsible for loading the
appropriate `config/environments/*.rb` file.

Normally, when booting an app, `Rails.application.initialize!` is called
without arguments by `config/environment.rb`, which is loaded via
`Rails.application.require_environment!`.  Doing so runs all
initializers.

Running all initializers is problematic for credentials commands because
(1) initializers might try to access resources that aren't available
(e.g. a production database), and (2) initializers might try to read
credentials values that have not yet been set in the current
environment's credentials (see #34789).

Thus, the credentials commands call `Rails.application.initialize!`
directly with a dummy group argument, so that initializers in the `:all`
group -- including `load_environment_config` -- are run, but not
initializers in the default group, such as
`active_record.initialize_database` and `load_config_initializers`.

Closes #40778.

Co-authored-by Brian Thoman <>