ollama: use finalAttrs and fix version overriding

[ShamrockLee]

Things done

This PR makes it possible to override the version attribute of package ollama using buildGoModule's newly-added fixed-point arguments (finalAttrs: { }) support.

• 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/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 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.

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[abysssol]

I don't understand why a fixed point function is being used as opposed to simply adding a version argument to the package. I don't even understand how this would actually be used to change the version. A package argument could be changed with override or callPackage; how would this be used?

[drupol]

I don't understand why a fixed point function is being used as opposed to simply adding a version argument to the package.

AFAIK, there are multiple reasons:

1. This is a not a practice adopted widely in nixpkgs
2. Adding a parameter will require adding one (or multiple) hash parameters too

I don't even understand how this would actually be used to change the version. A package argument could be changed with override or callPackage; how would this be used?

It would be used as such:

ollama' = ollama.overrideAttrs (oldAttrs: {
  # Change what you want in here, and you have access to the current attributes through `oldAttrs` if needed.
});