Upgrade isobuilders to Bullseye
Our Jenkins isobuilders currently run Buster. By the time Buster is not supported anymore (~2022, with no info for LTS yet) we'll need to update them to Bullseye.
Also, a more recent virtualization stack (libvirt, QEMU, Linux kernel) may provide performance improvements, that would be most welcome (#16960). If this upgrade is cheap, it might be worth applying it earlier rather than later.
Let's figure out what's needed to make it happen!
- Blocks tails#17976 (closed)
EDIT: this issue was created when builders were running Stretch, so the above description has been edited to account for their upgrade to Buster. Have this in mind when reading the issue history.