Feature Request: Add tags for older releases of PF_Ring

[jmwample]

Per the documentation using pfring in docker requires that the version installed on the host is the same as that installed on the container. The containers released here continually update to follow whatever version is the latest with the ubuntu 20.04 apt package. This is an issue because licensing is (relatively) static and packages installed on the host are placed in packaging holds to prevent updates.

This means that:

1. these containers may suddenly stop working for a host on rebuild when the packaged release versions updates.
2. hosts with an older version (even a previously packaged release like 7.8.0) cannot support containers without updating licenses or installing from source in their Dockerfile.

It would be great to have tags in the docker releases with the version of pfring in order to support containers for older pfring releases. (i.e. ntop/pfring:8.0.0-ubuntu, ntop/pfring:7.8.0-ubuntu, ntop/pfring:7.6.0-ubuntu, etc)

[jmwample]

update - as an example (and for my own use) I have built some of the recent releases from source with ubuntu as the base docker image. Would love to see something like this in the official dockerhub repo. I may also update this again if I can figure out the dpkg-buildpackage system.

https://hub.docker.com/r/jmwample/pfring