The author has not signed-off on the contribution

The signed-off-by validation is failing if it's not the last line:

commit e8c6da660643bcc77ea33d399f6a90e7c6d11e6b (HEAD -> cguindon/test/eca)
Author: Christopher Guindon <chris.guindon@eclipse-foundation.org>
Date:   Tue Dec 8 16:06:52 2020 -0500

    add readme.md
    
    Signed-off-by: Christopher Guindon <chris.guindon@eclipse-foundation.org>
    Change-Id: I139e2d803770ef65e55645e2d499731ffb749300

Result:

 ! [remote rejected] HEAD -> refs/for/master (commit e8c6da6: The contributor must sign-off on the contribution.)
error: failed to push some refs to '../webdev/devops'

The workaround is to move the sign-off-by section after the Change-Id. However, we can't expect our users to do that. The requirement is simply to include the in the footer section of a commit message.