[x] increase version number in release-tools version for the releases/19.12 branch to 19.11.90
[x] run increase_repos_version.sh
[] git: fetch and change to releases/19.12 branch in pkgapplications server
[] cleanup artifacts from old releases
[] run update_l10n.sh in capona
[] run pack_all.sh in capona
[] copy tars and and signatures to proper location in milonia
[] run tag_all.sh in your local machine
[] run bash add_bugzilla_versions.sh in your local machine
[] more stuff