ci: split stable and unstable tests

Author: sandydoo

.github/workflows/ci.yaml

@@ -37,7 +37,22 @@ jobs:
     - name: Check nixpkgs-unstable
       run: nix flake check -L --show-trace
 
+    - run: nix eval .#lib.x86_64-linux.run --show-trace
+
+  tests-flakes-stable:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v30
+    - uses: cachix/cachix-action@v15
+      with:
+        name: pre-commit-hooks
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+    - run: rm -rf /opt&
+
     - name: Check nixpkgs-stable
       run: nix flake check -L --show-trace --override-input nixpkgs github:NixOS/nixpkgs/nixos-24.11
 
-    - run: nix eval .#lib.x86_64-linux.run --show-trace