I use 'guix environment <somepackage>' and 'guix system vm config.scm' every day. I don't need more, cause these two solves most of the problems that was described earlier.

What is it I can provide that would be clearer, more common usage, than the examples I use almost literally as they are here?

And that 9 line docker file references at least one other unknown file, and is part of a bigger program. Docker would not be able to reproduce with the information given in that post. How do you expect me to reproduce something with at least 2 huge unknowns?

That is why you got a more generic answer for implementation, but once you have your implementation once, you only need the commandlines I provided.