Add CI jobs for rebase automation

Merge request !111 (closed) adds a number of scripts that can be tied into cron jobs/CI. Once this is merged there are a few next steps.

• Automatically run redhat/scripts/ark-update-config.sh nightly, and when git tag pushes if the tag is in Linus's tree.
• Automatically run redhat/scripts/ark-rebase-patches.sh nightly if we adjust the issue reporting to reliably reference commits from previous ark/patches/<tag> branches so the commit hashes are stable, and when a new tag is pushed from Linus's tree.
• Automatically run redhat/scripts/ark-create-release.sh after ark-update-config.sh and ark-rebase-patches.sh run on a git tag from Linus's tree (e.g. v5.5 or v5.6-rc1).
• It would be nice to get redhat/scripts/ark-brew-build.sh run automatically after ark-create-release.sh. However, it would need credentials for submitting builds and pushing to dist-git.
• Update the wiki documentation to point to these scripts and associated jobs.