Create github action for triggering a new library release

[ArtificialPB]

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📝 Description

Doing it locally can be a bit error-prone and is not convenient to set up all the keys on multiple machines. It can also cause uncommited files to get released if the local repository is not clean.

Create a github action task which can be manually triggered to release the library. Specifically, it should do the following:

• checkout the latest tag (see docs: https://github.com/actions/checkout)
• set LIB_RELEASE=true env variable
• run ./gradlew publish --no-parallel
• run ./gradlew publishPlugins

Remaining questions:

• does it break anything if we submit the same tag multiple times? can we check if tag already released?