Prepare tarballs:
[x] increase version number in release-tools version for the releases/19.12 branch to 19.11.90
[x] run increase_repos_version.sh in your local machine
[x] git: fetch and change to releases/19.12 branch in pkgapplications server
[x] cleanup artifacts from old releases (sources/* and versions/*)
[x] run update_l10n.sh in capona
[x] run pack_all.sh in capona
[x] copy tars and and signatures to proper location in milonia
[x] announce packages to release-team list, including changelog, hashes, and signature verification key
[x] copy versions/* to local machine, needed for tagging and create_log.sh
[x] run create_sources_inc > sources.inc on capona
On release day:
[x] open download area in milona (chmod 755)
[x] commit sources.inc as www/info/source-applications-19.11.90.inc
[x] commit www/info/applications-19.11.90.php
[x] run tag_all.sh in your local machine
[] run add_bugzilla_versions.sh in your local machine
[x] publish release text from https://invent.kde.org/websites/kde-org-announcements-releases/content/19.12-rc
[x] commit announcements to www/announcements/index.php and www/index.php
[] post announcement to announce at kde.org list, to reddit, etc.
[] more stuff