Fly Apps on machines: prerelease of fly deploy

Not sure you can send request over any (Fly VPC) 6pn IP and wake up the Machines. The only way I know of is to assign a Flycast IP, which is like an Anycast IP but for 6pn. The only downside is that you can’t target any one particular Machine with a Flycast IP.

Flycast IPs are free to use (for now), but need to be assigned explicitly.