Also improve upload script to force push changelog branches.
Lintian v2.115 (which is run on Debian servers) still produces
pedantic warnings, but there seems to be a bug - no matter what
pattern I add to `lintian-overrides`, I can't get it to ignore
the files. The following version v2.116 has these rules built in,
so we don't need `lintian-overrides` anymore.
The Dev Containers vscode extension allows to run the unit tests in a container.
This is especially helpful when running on Ubuntu 22.04 where running the tests
on the host exits ibus when the tests exit, disabling any keyboard input.
