This is obsolete. Releasing can be done by triggering github actions, which will do approximately the below, but using batch mode.
mvn release:branch -DbranchName=REL-5.13-SNAPSHOT -DdevelopmentVersion=5.14-SNAPSHOT
git checkout REL-5.13-SNAPSHOT
mvn -Pdeploy,ossrh release:prepare release:perform -DreleaseVersion=5.13.0 -DdevelopmentVersion=5.13.1-SNAPSHOT
to deploy to vpro-nexus directly (avoid waiting for sync with maven central), checkout out the tag and deploy:
git checkout REL-5.15.1
mvn -Pvpro-nexus deploy
You can start with vpro-nexus:
git checkout REL-5.15-SNAPSHOT
mvn -Pvpro-nexus release:prepare release:perform -DreleaseVersion=5.15.4 -DdevelopmentVersion=5.15.5-SNAPSHOT