Adds conan for macOS directions
Adds conan for macOS directions

Solves https://github.com/greenplum-db/gpdb/issues/3176

greenplum-db/gpdb,50wu/gpdb,ashwinstar/gpdb,xinzweb/gpdb,greenplum-db/gpdb,Chibin/gpdb,50wu/gpdb,janebeckman/gpdb,yuanzhao/gpdb,edespino/gpdb,yuanzhao/gpdb,xinzweb/gpdb,xinzweb/gpdb,janebeckman/gpdb,yuanzhao/gpdb,janebeckman/gpdb,adam8157/gpdb,adam8157/gpdb,xinzweb/gpdb,edespino/gpdb,Chibin/gpdb,greenplum-db/gpdb,edespino/gpdb,edespino/gpdb,janebeckman/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,edespino/gpdb,lisakowen/gpdb,janebeckman/gpdb,50wu/gpdb,adam8157/gpdb,edespino/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,xinzweb/gpdb,lisakowen/gpdb,Chibin/gpdb,Chibin/gpdb,ashwinstar/gpdb,lisakowen/gpdb,yuanzhao/gpdb,janebeckman/gpdb,adam8157/gpdb,yuanzhao/gpdb,lisakowen/gpdb,edespino/gpdb,janebeckman/gpdb,yuanzhao/gpdb,adam8157/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,janebeckman/gpdb,adam8157/gpdb,Chibin/gpdb,Chibin/gpdb,jmcatamney/gpdb,lisakowen/gpdb,lisakowen/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,adam8157/gpdb,janebeckman/gpdb,jmcatamney/gpdb,adam8157/gpdb,Chibin/gpdb,50wu/gpdb,greenplum-db/gpdb,lisakowen/gpdb,edespino/gpdb,50wu/gpdb,lisakowen/gpdb,yuanzhao/gpdb,Chibin/gpdb,greenplum-db/gpdb,xinzweb/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,edespino/gpdb,50wu/gpdb,Chibin/gpdb,xinzweb/gpdb,Chibin/gpdb,50wu/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,50wu/gpdb,edespino/gpdb,greenplum-db/gpdb,xinzweb/gpdb,jmcatamney/gpdb,janebeckman/gpdb,jmcatamney/gpdb