* chore: Add signrel command for sigining arc release assets
I used this command to sign assets for the recent releases to comply with the recommendation of 5758364c82/docs/checks.md (signed-releases)
Ref #1298
* Implement signrel subcommands for listing tags and signing assets, with docs
One of the pod recreation conditions has been modified to use hash of runner spec, so that the controller does not keep restarting pods mutated by admission webhooks. This naturally allows us, for example, to use IRSA for EKS that requires its admission webhook to mutate the runner pod to have additional, IRSA-related volumes, volume mounts and env.
Resolves#200
