fix(ci/eval-stats): resolve prResult symlink

[hsjobeki]

Fixes the performance stats report.

The problem that can be observed is that the prResult seems to not contain a /stats subdirectory. So also this PR should also omit the performance report, because the eval.yaml from master is executed.

I tested the solution here

This seems to be caused because prResult is a symlink pointing into the nix-store. Weirdly calling Path(prResult).resolve() in python inside the derivation doesn't work.

in constrast i now used realpath directly which works.

I didn't manage to find the exact root-cause why realpath and resolve() behave differently. Here are some of my guesses:

• realpath (shell): resolves symlinks fully and immediately, returning an absolute path to the actual directory or file.
• Path.resolve() (Python): attempts the same, but behaves more conservatively
• The Python interpreter runs in a sandboxed environment, where symlink resolution doesn't always behave as in normal environments.

Things done

• Fixed resolving the stats directory correctly
• Alphabetical sorting of the output

• 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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[nixpkgs-ci]

Backport failed for release-24.11, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release-24.11
git worktree add -d .worktree/backport-404967-to-release-24.11 origin/release-24.11
cd .worktree/backport-404967-to-release-24.11
git switch --create backport-404967-to-release-24.11
git cherry-pick -x c8276114ac18237c8fcf5a2e416578aab58eb393 4f64ebd02b0cf1623bf4bf13a27a7a2d1b186b2e