OSX diskimages need 0775 folder permissions
OSX diskimages need 0775 folder permissions

Avoids endless Gatekeeper warnings (#7085)

Conflicts:
	contrib/gitian-descriptors/gitian-osx-signer.yml

Github-Pull: #8169
Rebased-From: cdf7dff4248ec4050e535079227dd57cbfb610e4

jaromil/faircoin2,jaromil/faircoin2,faircoin/faircoin2,faircoin/faircoin,faircoin/faircoin2,jaromil/faircoin2,jaromil/faircoin2,jaromil/faircoin2,faircoin/faircoin,faircoin/faircoin,faircoin/faircoin2,faircoin/faircoin2,faircoin/faircoin2,faircoin/faircoin,jaromil/faircoin2,faircoin/faircoin,faircoin/faircoin,faircoin/faircoin2