amazon web services - opsworks - single ssh key to all instances? is there any way? -

is there way use single ssh key instances create in stack? or each created instance i'll need enter ssh, generate ssh key , add github deploy keys?

in opsworks each github repo want deploy instances, need set app (under apps), there input repo address , ssh key accessing repo. 1 key per repo. when "app deploy", opsworks automatically take key , place on instance, same directory code , use pull code repo.