The detailed process of how to prepare an Ignite release can be found in Apache Ignite wiki https://cwiki.apache.org/confluence/display/IGNITE/Release+Process
Scripts contained in this repository automate part of actions for
Pre-vote steps 4.3.x
https://cwiki.apache.org/confluence/display/IGNITE/Release+Process#ReleaseProcess-4.3.SignanddeployRCusingvotepreparationscripts
and for post release steps 6.2.x
https://cwiki.apache.org/confluence/display/IGNITE/Release+Process#ReleaseProcess-6.2.RunReleasescripts