lunar-client: migrate to by-name and add updateScript

[surfaceflinger]

Description of changes

as in title.
also please lmk if this script will work with r-ryantm bot :)

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.11 Release Notes (or backporting 23.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[OPNA2608]

Result of nixpkgs-review pr 263015 run on x86_64-linux 1

1 package built:

• lunar-client

Hash & fetched binary works. Update script tested by setting version to 3.0.0 and running it, which correctly reset everything to the values in this PR. LGTM.

Was trying my hardest to see if update-source-version could be used instead of seding around in the package file, but it can't handle appimageTools.wrapType2 -> appimageTools.wrapAppImage -> buildFHSEnv not setting a version 🙁.

---

also please lmk if this script will work with r-ryantm bot :)

If it works for nix-shell maintainers/scripts/update.nix --argstr package lunar-client, then it should work for the update bot.

[surfaceflinger]

Was trying my hardest to see if update-source-version could be used instead of seding around in the package file, but it can't handle appimageTools.wrapType2 -> appimageTools.wrapAppImage -> buildFHSEnv not setting a version 🙁.

yeah, I spent quite lots of time trying that already

[OPNA2608]

(I guess this package is also lacking meta.mainProgram, but again not a deal breaker for this PR)

(and meta.description is not supposed to have a trailing .))

[pbsds]

You can test the updater script with nix-update lunar-client -u

[pbsds]

Result of nixpkgs-review pr 263015 run on x86_64-linux 1

1 package built:

• lunar-client

Builds and runs fine, tested the update script. LGTM