agrees to a Developer Certificate of Origin
(see http://developercertificate.org/ for more information).
--S[<keyid>]::
---gpg-sign[=<keyid>]::
- GPG-sign the resulting merge commit. The `keyid` argument is
- optional and defaults to the committer identity; if specified,
- it must be stuck to the option without a space.
-
-m <msg>::
Set the commit message to be used for the merge commit (in
case one is created).