ostree-gpg-sign - Sign a commit

       Add a new signature to a commit for each specified GPG key. Note that currently, this will append a new
       signature even if the commit is already signed with a given key.

       ostree-gpg-sign - Sign a commit

--delete
           Delete signatures having any of the GPG KEY-IDs.

       --gpg-homedir="HOMEDIR"
           GPG Homedir to use when looking for keyrings.

OSTree                                                                                        OSTREEGPG-SIGN(1)

ostreegpg-sign [OPTIONS...] {COMMIT} {KEY-ID...}