[Nix-dev] NixOS: entry in configuration to list packages that should not be gc-ed

[Freddy Rietdijk]

Dear Nixers,

There are a bunch of packages I would always like to have available in the
Nix store, but that I do not want directly in my primary environment. These
packages I would like to specify in `/etc/nixos/configuration.nix` so that
on a rebuild these are always available without downloading/building when I
need them.

I know that with `nix-shell` it is possible to prevent packages from being
gc-ed, however, I would like to specify the list of packages in
`configuration.nix`. Is there any such way?

Kind regards,

Freddy
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