allow adding dependencies by package name

[oliverrahner]

I am trying to use the command po4a-gettextize which has no hard dependency on perl-yaml-tiny, but I do need that dependency for my use case.
I have found no way to add that package, as it does not expose any command.
It would be nice to have a way to add packages to an image, either by falling back to using the input as a package name or by some kind of prefix.

So, either
docker pull cmd.cat/po4a-gettextize/perl-yaml-tiny
should automatically handle perl-yaml-tiny as a package name, as it does not get any result from the command-not-found API
OR
use e.g.
docker pull cmd.cat/po4a-gettextize/@perl-yaml-tiny,
using @ as an explicit decorator for package names.

[hoozecn]

@ is not a valid character in docker image name. Check #10 to see if it met your need

[oliverrahner]

My use case has vanished in the past weeks, but #10 looks as if it would solve my need!