Implement raising error on pending migrations

[kyranb]

Rails has a super handy abort_if_pending_migrations that returns a status code that can be used to check whether all migrations have been run before serving traffic.

This kind of thing is super helpful in a kubernetes deployment

initContainers:
      - command: ["/usr/local/bin/php", "artisan", "migrate:abort-if-pending"]
``

See here:
https://github.com/rails/rails/blob/main/activerecord/lib/active_record/railties/databases.rake#L339

I found this package: https://github.com/erjanmx/laravel-migrate-check

However it feels like something useful enough to become part of the artisan migrate command natively.