job_services/sourcehut: Remove cache_apk_* with sudo
The files have permissions 0644 and are owned by root:build, so the build user cannot remove them without sudo.
-rw-r--r-- 1 root build 470120 Mar 6 08:37 APKINDEX.066df28d.tar.gz
rm: cannot remove '/home/build/.local/var/pmbootstrap/cache_apk_x86_64/APKINDEX.066df28d.tar.gz': Permission denied