step-cli: fix hash

[pbsds]

Apply the same fix as in amaranth-boards

fixes https://hydra.nixos.org/build/277511307 via #352644 (comment)
zhf #352882

closes #355009

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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[K900]

This feels wrong? We're not even getting a full git checkout here, just a tarball. Have you confirmed that this is the issue?

[pbsds]

• fetchFromGitHub is not reproducible when export-subst is used #84312

My guess is that the master branch also pointed to the ref when the hash was set

[Mic92]

This feels wrong? We're not even getting a full git checkout here, just a tarball. Have you confirmed that this is the issue?

The github api does this with tarballs. Gitea as well. This is a known issue. Also see NixOS/nix#11467