What would be great is (in v7) is to be able to run docker containers so that we can run custom applicationsLike written above, this request doesn't make any sense.
Docker is used to run applications.
RouterOS is an operating system.
Use CHR images.
Looks like kernel should be enough, e.g. container images can use their own library versions.Docker relies on the "parent" OS to have all the necessary stuff. RouterOS doens't have any stuff to rely on. Maybe I'm mistaken, not sure if RouterOS kernel is enough.