add release body

Signed-off-by: Sebastian Hoß <seb@hoß.de>

Author: Sebastian Hoß

.github/workflows/mavenpublish.yml

@@ -43,3 +43,4 @@ jobs:
           release_name: Release ${{steps.release.outputs.version}}
           draft: false
           prerelease: false
+          body: Automated release, see [commits](https://github.com/metio/maven-build-process/commits/master) for changes