Bazzite answered git's password prompts from KDE Wallet via ksshaskpass, which
Ubuntu won't have. Build git's libsecret helper (Ubuntu ships it as source only)
and point credential.helper at it, falling back to a week-long credential cache
if the build isn't possible. Note in the README that the first Gitea push has to
re-enter the password, since keyrings aren't in the backup.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>