Release Bot - release

[richtja]

The release of autils will be based on a number of criteria such as a threshold of changes and the approval by maintainers.

The definition of done for this issue is to have a bot that will take those criteria into account and perform a release, including bumping the version, tagging the new version and releasing packages.

This is a continuing work after #7, which bring the automated release voting process. This issue is about automatization of release itself in the same way how it is done in avocado.

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Part of #1