dogdns: install shell completions and man page

[danieldk]

Motivation for this change

Install the upstream shell completions and manual page.

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.

[teto]

Have you checked the closure size ? bringing pandoc in is huge. As much as I love having manpages, maybe it should be gated behing a withManpage flag.

[danieldk]

Have you checked the closure size ? bringing pandoc in is huge. As much as I love having manpages, maybe it should be gated behing a withManpage flag.

Good point. I think not having a man page is a suboptimal experience, so I opened an upstream issue to ask if they could include the generated man page in the repository:

ogham/dog#3

[danieldk]

@bbigras we should probably do likewise for nuspell.

[evanjs]

Looks like we just need the man page, now?
Seems like @marsam added the completions with f4e1112 (part of #103131).