ci: add pr-rebase.yaml

[kylesomers]

Issue number:

Summary

Changes

• Adds a new GitHub workflow that rebases PR branch onto main when triggered manually.
• The workflow uses a pre-built 3rd party action.

User experience

Please share what the user experience looks like before and after this change

• When a rebase is needed, add PR comment /rebase which will trigger workflow to rebase the current branch onto main.
• Ability to trigger workflow is restricted to members of the GitHub Org.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change?

Acknowledgment

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[jorisdon]

Workflow LGTM, but check the checkov reports and make decision as needed

[henrykie]

dependabot has a cool feature where I can @dependabot rebase and it'll rebase a branch. I wonder if we could build the same thing with our cloud-game-development-toolkit bot?

[henrykie]

https://github.com/chrisledet/rebasebot#setup like this one which just runs on an EC2 instance...