matrix: Restart mjolnir on failure

With a delay of 30 seconds. Reduce the sleep hack in pantalaimon from 30
to 10 seconds. Hopefully this is going to bring it up reliably.
2 jobs for master in 36 seconds (queued for 3 seconds)
Name Stage Failure
ansible-lint Test
You can skip specific rules or tags by adding them to your configuration file:
# .config/ansible-lint.yml
warn_list: # or 'skip_list' to silence them completely
- experimental # all rules tagged as experimental
- yaml # Violations reported by yamllint.

Finished with 24 failure(s), 8 warning(s) on 924 files.
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1