Use chroot_scan with the write_tar = True option

[praiskup]

This will save us a lot of inodes.

$ tar tvvf /var/lib/copr-rpmbuild/results/chroot_scan.tar.gz 
drwxrwxr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/
drwxr-xr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/
drwxr-xr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/
drwxr-xr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/mock/
drwxr-xr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/mock/fedora-rawhide-x86_64-1727448498.772893/
drwxr-xr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/mock/fedora-rawhide-x86_64-1727448498.772893/root/
drwxr-xr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/mock/fedora-rawhide-x86_64-1727448498.772893/root/var/
drwxrwxr-x mockbuilder/mock  0 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/mock/fedora-rawhide-x86_64-1727448498.772893/root/var/log/
-rw-r--r-- mockbuilder/mock 299060 2024-09-27 14:48 var/lib/copr-rpmbuild/results/chroot_scan/var/lib/mock/fedora-rawhide-x86_64-1727448498.772893/root/var/log/dnf5.log

[praiskup]

There's an older issue #2345.