$ docker run -it --rm \
  -v "$(pwd)"/cache:/cache \
  -v "$(pwd)"/log:/workspace/log \
  -v "$(pwd)"/ref:/srv/git:ro \
  -v "$(pwd)"/src:/workspace/src \
  docker-registry.wikimedia.org/releng/quibble-bullseye-php83:latest \
  --skip-zuul \
  --skip-deps \
  --shell

...

Traceback (most recent call last):
  File "/usr/local/bin/quibble", line 7, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/dist-packages/quibble/cmd.py", line 1011, in main
    cmd.execute(
  File "/usr/local/lib/python3.9/dist-packages/quibble/cmd.py", line 633, in execute
    quibble.commands.execute_command(command)
  File "/usr/local/lib/python3.9/dist-packages/quibble/commands.py", line 32, in execute_command
    with quibble.Chronometer(str(command), log.info):
  File "/usr/local/lib/python3.9/dist-packages/quibble/commands.py", line 1219, in __str__
    return "User commands: {}".format(", ".join(self.commands))
TypeError: sequence item 0: expected str instance, NoneType found