Links to hydra builds of platforms other than x86_64-linux and aarch64-linux are dead

[iFreilicht]

When searching for a package (let's take moreutils), links to each pacakges hydra runs are shown in the details view:

• aarch64-darwin
• x86_64-linux
• i686-linux
• aarch64-linux
• x86_64-darwin

These links are valid for x86_64-linux and aarch64-linux, but not for any other platforms, because the prefix is hardcoded to https://hydra.nixos.org/job/nixos/release-23.11/ (or nixos/trunk-combined on unstable).

The links should instead be created from a map that inserts the correct prefix for each platform. For the main ones, this would be:

• unstable
  • all except x86_64-linux and aarch64-linux: nixpkgs/trunk
• release (23.11 right now)
  • aarch64-darwin: nixpkgs/nixpkgs-23.11-darwin
  • x86_64-darwin: nixpkgs/nixpkgs-23.11-darwin

For other platforms there seems to be no dedicated hydra jobset right now.

Solving this issue might require searching for packages differently in the first place, which in turn could also fix #708

[vcunat]

And drop i686-linux. For unstable, all links might be to nixpkgs/trunk, as it evaluates more often.