[ahslian]

Internally, we don't use docker in our Remote Execution service implementation and the linux workers use cgroups to isolate whereas the macOS and Windows story is still being worked on.

IIUC, the publicly available Remote Execution services out there are specified by docker, so we chose to have OSS buck2 align to that.

As noted, local mode doesn't do anything else at this point, but we've discussed exactly this to help developers identify dependency declarations earlier.