fix: update CI workflow to build Nix flake configurations

The old workflow referenced deleted setup/ scripts. Updated to build
NixOS, nix-darwin, and home-manager configurations per architecture.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: myuron

.github/workflows/test.yml

@@ -1,25 +1,26 @@
-
 name: TEST
 
 on: [push]
 
 jobs:
-  make:
-    runs-on: macos-15-intel
-
-    defaults:
-      run:
-        shell: bash
-
+  build-linux:
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Nix Install
-        run: |
-          set -x
-          ./setup/setup-nix.sh
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Build NixOS
+        run: nix build .#nixosConfigurations.myNixOS.config.system.build.toplevel
+      - name: Build Home Manager (NixOS)
+        run: nix build .#homeConfigurations.myHome-nixos.activationPackage
 
+  build-darwin:
+    runs-on: macos-15-intel
+    steps:
       - uses: actions/checkout@v4
-      - name: Symlink Setup 
-        run: |
-          set -x
-          ./setup/setup-symlink.sh
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Build nix-darwin
+        run: nix build .#darwinConfigurations.myDarwin.system --impure
+      - name: Build Home Manager (Darwin)
+        run: nix build .#homeConfigurations.myHome-darwin.activationPackage