The
Line 1 in 03bbbcc
FROMdebian:buster Dockerfile used for testing is based on Debian Buster, which is soon old-oldstable behind Debian Bullseye and Debian Bookworm.
I suspect testing on an old Debian release is intentional to ensure compatibility of newer releases with old OS environments and package versions. Still, doing an (optional?) second test run with a newer container could catch issues that only exist in newer OS environments or newer package versions.
The https://codeberg.org/distrust/git-sig/src/commit/03bbbcc350177fe359892d70789e0c8a60bd30dd/test/Dockerfile#L1 Dockerfile used for testing is based on Debian Buster, which is soon `old-oldstable` behind Debian Bullseye and Debian Bookworm.
I suspect testing on an old Debian release is intentional to ensure compatibility of newer releases with old OS environments and package versions. Still, doing an (optional?) second test run with a newer container could catch issues that only exist in newer OS environments or newer package versions.