Migrate to GitHub Actions

[flokuep]

To reduce some dependencies and have a more smooth integration into GitHub, we should consider switching to GitHub Actions for building nightly and release versions.

The most complicated part of achieving this is the version number handling which is solved by some scripts currently.

While doing this, we could think about skipping transifex-pullrequests automatically.

[flokuep]

@Jiiniasu I've seen that you already made some experience with that topic, on your forks. Any knowledge or solved problems you can share with us?

[Jiiniasu]

The Github actions I have in my SSIS-Remote branch is my first experience with it, so can't say I have too much knowledge/learnings that aren't basic usage.

How is the current Appveyor set up? Are there parts that can only be seen with some kind of login to the service?

[flokuep]

Ah, okay. Same here :) I've just playing around with GH Action on my fork...

No, all Appveyor configuration should be within the appveyor.yaml and the referenced build-scripts within the repository itself.