Switch to GitHub Actions

[andyundso]

This PR switches the pipeline for tiny_tds from CircleCI to GitHub Actions.

Functionality-wise, they should be equivalent, although I made a couple of additions:

• The ports are compiled in one step for all the Linux jobs, similar to how we do this for Windows.
• Test summary is displayed for each job, e.g. here.
• The built gem versions for Windows can also be downloaded from that page.
• I also test the installation of the gem on Mac with M1 processors. This was something I added once to CircleCI for #545, only to realise it is only available for paid organizations.

Open questions / points from my side:

• Currently, the installation on Windows for MSSQL 2017 is broken, so I commented it out in the matrix and reported an issue upstream (https://github.com/potatoqualitee/mssqlsuite/issues/27). Worst case we could re-activate the solution we used for CircleCI, as I did not find another action that can install multiple versions of SQL server and on different platforms. I could also fork (or re-implemented) a similar solution on my own time.
• docker-composee.yml currently uses the CircleCI Ruby image. I like having this compose file around for a quick start into tiny tds development, but I would suggest to switch the official Ruby images from Docker Hub.
• There are a bunch of scripts we no longer would need (like setup_cimgruby_dev).

[bf4]

quick and dirty brainless importer didn't work. but now that there's an action on main with workflow dispatch, you can test it in a PR

example failures https://github.com/rails-sqlserver/tiny_tds/actions/runs/8888886154