Support Rails 7

[eugene-jetruby]

Rails 7 was released in December 2021. At the moment https://github.com/rom-rb/rom-rails/blob/master/rom-rails.gemspec depends on railties < 6.2, which makes it impossible to install with Rails 7. Please consider supporting Rails 7.
Thank you.

[jacob-s-son]

@sasa-b , I saw in the latest PR that you were given the reigns of maintainer. If look into this and make necessary fixes, would you consider merging? I am working on a new rails project and keen to make some good choices at the very beginning of the project to improve future modularity and maintainability.

P.S. Additionally I would love to add docker/docker-compose support, so that contributing does not require runtime setup on the host machine. Let me know what you think.

[sasa-b]

@jacob-s-son I would love that, go for it!

[voigtito]

Hi, any news on this issue? I saw that the PR is open but it needs a review from a maintainer