When recreating the chroot, it fails for other reasons:

Enumerating objects: 5, done.
Counting objects: 100% (5/5), done.
Delta compression using up to 2 threads
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 1.06 KiB | 1.06 MiB/s, done.
Total 3 (delta 2), reused 0 (delta 0), pack-reused 0
remote: HEAD is now at 4eef26124 libre: linux-libre-vanilla: update to 6.0.10
remote:   -> Updating abslibre git repo...
remote: Fetching origin
remote: Already on 'master'
remote: Your branch is up to date with 'origin/master'.
remote: From git://git.parabola.nu/abslibre/abslibre
remote:  * branch                master     -> FETCH_HEAD
remote: Already up to date.
remote: /usr/share/makepkg/util/pkgbuild.sh: line 92: your-freedom-blacklist-fc418f69715d79600b405a86eb19382ddfdf11c6.txt: No such file or directory
remote: ==> Retrieving sources...
remote:   -> Downloading your-freedom-blacklist-fc418f69715d79600b405a86eb19382ddfdf11c6.txt...
remote:   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
remote:                                  Dload  Upload   Total   Spent    Left  Speed
remote: 100 78999  100 78999    0     0  1428k      0 --:--:-- --:--:-- --:--:-- 1402k
remote: ==> Generating checksums for source files...
remote: [master 51624148d] Update libre/your-freedom
remote:  1 file changed, 3 insertions(+), 3 deletions(-)
remote: error: failed to initialize alpm library:
remote: (root: /, dbpath: /var/lib/pacman/)
remote: could not find or read directory
remote: 
remote: ==> ERROR: An unknown error has occurred. Exiting...
remote: ./hooks/post-receive: line 2: 3145079 User defined signal 1   ~autobuilder/.local/bin/autobuild libre/your-freedom blacklist.txt
remote: HEAD is now at 4eef26124 libre: linux-libre-vanilla: update to 6.0.10
remote:   -> Updating abslibre git repo...
remote: Fetching origin
remote: Already on 'master'
remote: Your branch is up to date with 'origin/master'.
remote: From git://git.parabola.nu/abslibre/abslibre
remote:  * branch                master     -> FETCH_HEAD
remote: Already up to date.
remote: ==> No new changes were committed, nothing to do
remote: HEAD is now at 4eef26124 libre: linux-libre-vanilla: update to 6.0.10
remote:   -> Updating abslibre git repo...
remote: Fetching origin
remote: Already on 'master'
remote: Your branch is up to date with 'origin/master'.
remote: From git://git.parabola.nu/abslibre/abslibre
remote:  * branch                master     -> FETCH_HEAD
remote: Already up to date.
remote: ==> No new changes were committed, nothing to do
To ssh://git.parabola.nu:1863/~git/blacklist.git
   f832cfd..fc418f6  HEAD -> master

According to bill-auger this hook / automatic builds have been broken for more than one year,and the current workaround is to wait for bill-auger to rebuild the your-freedom packages manually.

there may be a broken/buggy bit of tooling - i have investigated something similar in the past (dont remember off-hand)

ok IIRC now, i hacked the importer to use the system 'your-freedom' package for the blacklist, instead of the git source; but i had not upgraded the package on the repo server yet