feat: add pre-release option

[ybaldus]

Closes #678

This pull request adds the ability to set a release type mode for GitHub and Gitea. It uses the modes which where defined beforehand:

• Prod: ready for production
• Pre: pre-release
• Auto: pre-release detection based on a semver version within the git tag

[MarcoIeni]

The rest looks great! If you want to also write an integration test it's up to you.
Otherwise, if you address that comment, this PR is ready to be merged.
You can also add the test in a later PR if you prefer.
Did you test this manually?

[ybaldus]

Thank you for the feedback and the help!

I didn't test it yet. I will have to set up a seperate repo for that and I will have to look into the cargo release. That's why I set this as draft. I will leave for vacation and thought it might be better to open the PR before.

[MarcoIeni]

I tested it on gitea and it works, thanks!

I will merge this, so that we ship this feature earlier. If you want you can submit another PR to add the test