so apparently the attacker:
- broke into jenkins
- noticed flywheel (OS X build server) having ssh access from outside through a forwarded port
- used those two to take flywheel
- waited for someone to connect to flywheel and forward their agent
- used the agent to get access to every server and add their key to a authorized_keys2 so it wouldn't get overwritten
last issue atm: "Monitor log files to avoid relying on external whitehats"
👏 😍