Use ipv6 to avoid public ipv4 address charges

[robinld]

Untested but I think this is directionally right Stacked on #24

[m-chandler]

Thanks for this one too @robinld. I'm unfortunately no longer across all these AWS changes. If it's untested, I might just give it a deploy over the weekend to be sure before merging.

[robinld]

Turns out this doesn’t work cuz m3.medium doesn’t support ipv6. I tried some other instance types, like c6gd, but I couldn’t get it to work with ECS. It wasn’t recognizing it as a “container instance”. I thought putting that ecs ami on it would be enough for it to be a container host.