Making a Source Tarball

Make sure:

That the version is set correctly in the toplevel CMakeLists.txt
That the version of the krita.xmlgui file has been bumped up
That there is a tag set for the release like this:

 git tag -a v3.0.99.89 -m "Krita 3.0.1 Alpha" e278ff7
 git push origin --tags

Then:

Check out kde-dev-scripts

git clone kde:kde-dev-scripts

Go into the createtarball folder, update the information in the config.ini file to reflect the right tag and version number, commit and push and run the script

PATH/TO/kde-dev-scripts/createtarball/create_tarball_kf5.rb -n -a krita