feat: allow to configure migrations configuration files

[MatTheCat]

This PR introduces a new orm.reset.migrations.configurations configuration node allowing a schema reset to run doctrine:migrations:migrate for each given configuration. This is useful because using doctrine/migrations, you can only target one single connection or entity manager per configuration file.

Fixes #685

[nikophil]

Please add a test for this 🙏

[MatTheCat]

@nikophil not sure how to add a test; my attempt fails and I don’t understand why 🤔

[nikophil]

hum this error Can't create database 'cms'; database exists already drove me crazy few days ago, I need to deep dive into it... we're doing some weird stuff with migrations and with this "cms" schema.

Another thing is that I think we should not have a full test suite with "migration with configuration", or even for "migration" at all. But this goes way beyond the purpose of this PR.

What about this: please, remove all the modification about the CI (sorry for your wasted time around it), and let's merge your PR. I've manually tested your branch on a project of mine and can confirm it is working. I will then work on a cleaner solution for this whole thing in the tests

[MatTheCat]

No worries, I procrastinated a lot on this one..!

Reverted every test-related change 🧹

[nikophil]

LGTM