fix 24.05 evaluation

.github/workflows/test.yml

@@ -7,11 +7,14 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        channel: [ nixos-unstable, nixos-24.05 ]
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@V27
       with:
-        nix_path: nixpkgs=channel:nixos-unstable
+        nix_path: nixpkgs=channel:${{ matrix.channel }}
     - name: Show nixpkgs version
       run: nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
     - run: ./tests/run.py