2024-02-26 05:57:33,640 [INFO] {899381} koji.build.buildroot:564 Running mock as kojibuilder
INFO: mock.py version 5.0 starting (python version = 3.11.5, NVR = mock-5.0-1.fc38)...
Start: init plugins
INFO: selinux disabled
Finish: init plugins
INFO: Signal handler active
Start: run
Start: clean chroot
Finish: clean chroot
ERROR: Could not create dir /var/lib/mock/f40-build-782017-131982/result. Error: [Errno 30] Read-only file system: '/var/lib/mock/f40-build-782017-131982'
Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/mockbuild/file_util.py", line 22, in mkdirIfAbsent
    os.makedirs(dirName)
  File "<frozen os>", line 215, in makedirs
  File "<frozen os>", line 225, in makedirs
OSError: [Errno 30] Read-only file system: '/var/lib/mock/f40-build-782017-131982'
ERROR: 
Could not create output directory for built rpms. The directory specified was:
    /var/lib/mock/f40-build-782017-131982/result

Try using the --resultdir= option to select another location. Recommended location is --resultdir=~/mock/.