As a single file editor committer I want to sign my commits so I can certify that the origin of the code is mine

Suggested

Modify the "Commit" button to state "Commit and Signoff"

This would append the string Signed-off-by: {first_name} {last_name} <{commit_email}> to the commit when submitted.

Requirements

We would need a designer/UX team member to look at this and come up with proposals. This is related and very similar to #368890