github: Add new checklist workflow

Add a new 'checklist' workflow that checks the commit messages on pull
requests. Currently, the workflow creates a comment on the pull request
if any of these cond

github: Add new checklist workflow

Add a new 'checklist' workflow that checks the commit messages on pull
requests. Currently, the workflow creates a comment on the pull request
if any of these conditions are hit:
- Missing Signed-off-by
- Malformed Signed-off-by
- Bad email (i.e *noreply*)

Reviewed by: emaste, imp
Pull request: https://github.com/freebsd/freebsd-src/pull/1570

Signed-off-by: Ahmad Khalifa <ahmadkhalifa570@gmail.com>

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