fix(nix): resolve hash race condition in parallel matrix jobs (#8995)

.github/workflows/nix-desktop.yml

@@ -9,6 +9,7 @@ on:
       - "nix/**"
       - "packages/app/**"
       - "packages/desktop/**"
+      - ".github/workflows/nix-desktop.yml"
   pull_request:
     paths:
       - "flake.nix"
@@ -16,6 +17,7 @@ on:
       - "nix/**"
       - "packages/app/**"
       - "packages/desktop/**"
+      - ".github/workflows/nix-desktop.yml"
   workflow_dispatch:
 
 jobs:
@@ -26,7 +28,7 @@ jobs:
         os:
           - blacksmith-4vcpu-ubuntu-2404
           - blacksmith-4vcpu-ubuntu-2404-arm
-          - macos-15
+          - macos-15-intel
           - macos-latest
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60