Manually triggered releases

[dfuchss]

I've created a workflow for manual releases of maven project for my personal projects.

I guess this workflow is easily usable within JPlag. Nevertheless, we need to discuss what kind of requirements does JPlag actually has. The basic script for the version update is maven-version-update.sh

The workflow generates two commits for releases: E.g.,

[dfuchss]

FYI @tsaglam @jplag/maintainer