gitian: use signapple to create the MacOS code signature
gitian: use signapple to create the MacOS code signature

Github-Pull: #20880
Rebased-From: f55eed251488d70d5e2e3a2965a4f8ec0c476853

monacoinproject/monacoin,monacoinproject/monacoin,monacoinproject/monacoin,monacoinproject/monacoin,monacoinproject/monacoin,monacoinproject/monacoin