(going from memory here, I believe this is accurate...) When attaching to a running Foo container w/ runc, the default user is root. That's true even if the F

(going from memory here, I believe this is accurate...) When attaching to a running Foo container w/ runc, the default user is root. That's true even if the Foo container was started w/ the Foo user. Can a Dockerfile specify the default user when someone attaches to the running container?