Configure Maven to deploy to GitHub package

[olivere]

As a software developer, I want to publish released versions of the repository to be publicly accessible from Maven and Gradle projects, so that external developers can easily use released versions in their code.

We can use GitHub packages for this (guidelines are here for Maven and Gradle). We can also configure GitHub Actions to deploy a package when a new version is tagged with thev* pattern.

Bonus points:

• Releasing the code will automatically create a changelog here

AC

• When tagging a new release, we publish to GitHub packages.
• Deployed packages are accessible to external developers publicly via Maven and Gradle.

[olivere]

See also: #11

[rwenz3l]

AC: Deployed packages are accessible to external developers publicly

Well, turns out - this is not possible right now for all packages "published" on github. See this Community Thread:
https://github.community/t/download-from-github-package-registry-without-authentication/14407

Last Staff Reply was Late 2019 with basically: "We may offer this someday".

[olivere]

So it requires a GitHub account, right? That's still a lot better than today, and we did it with the Mall API for Java as well (though not publicly). I wouldn't mind publishing it to Maven central, if that's an option (I think I registered an account for Meplato there). But that's beyond my expertise.