Add podgrab package and module

[ambroisie]

Motivation for this change

Closes #117284.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[ambroisie]

I opened an issue upstream about changing the webui's port, given that 8080 does not seem like the best choice for a default value... If the issues gets resolved I will update the module to be able to change the port.

Also, I wasn't sure how to test the basic authentication when passwordFile is set. If there is an easy solution, I'll add it to the tests.

[lukegb]

Thanks for the contribution!

[aanderse]

I have left a few comments on the module that I hope you will find helpful. Please let me know if you have any questions, etc...

[aanderse]

The module and test look good 👍

If interested you can list yourself as maintainer of the module too.
I think we're supposed to list maintainers on tests, so maybe consider adding yourself there if you don't mind.

Thanks!

[ambroisie]

Ah true I forgot to do that, will amend shortly.

[SuperSandro2000]

package LGTM

[ambroisie]

Friendly ping about this MR :-)