Fix owner group ids

[Mic92]

Why

Create images with owner 11000 / group 11000 so that they do not come up as the nobody user in the repl.it.

What changed

We switched to an lkl fork that supports this feature. An upstream pull request has been opened: lkl/linux#532

This is the second attempt for this. We also noticed that lkl doesn't properly flush the journal as it reboots too quickly. This is now addressed by lkl/linux#534 The no-recovery option is no longer required after that, even for read-only mounts.

Test plan

$ nix build .#bundle-image
$ sudo mount -o ro,loop ./result/disk.raw /mnt
$ ls -lan /mnt
total 37
drwxr-xr-x  5     0     0  4096 Feb  2  1970 .
drwxr-xr-x 21     0     0    21 Oct  6 13:08 ..
drwxr-xr-x  3 11000 11000  4096 Oct  6 14:24 etc
drwx------  2     0     0 16384 Oct  6 14:29 lost+found
drwxr-xr-x  3 11000 11000  4096 Feb  2  1970 nix

Rollout

• This is fully backward and forward compatible (assuming that no one depends on quirky behavior where files are owned by nobody)