ci: add test for build and switch

Signed-off-by: Qiming Chu <[email protected]>

.github/workflows/test.yml

@@ -0,0 +1,47 @@
+name: "Build and test"
+
+env:
+  NIXPKGS_BRANCH: nixpkgs-unstable
+  NIX_DARWIN_BRANCH: master
+  NIX_VERSION: 2.24.11
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+      - name: Build and switch
+        run: |
+          nix run nixpkgs#nixos-rebuild -- build --accept-flake-config --flake '.#nixos'
+          nix run nixpkgs#nixos-rebuild -- build --accept-flake-config --flake '.#wsl'
+  build-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+      - name: Install Nix
+        uses: cachix/install-nix-action@v30
+        with:
+          install_url: https://releases.nixos.org/nix/nix-${{ env.NIX_VERSION }}/install
+          nix_path: nixpkgs=channel:${{ env.NIXPKGS_BRANCH }}
+      - name: Install channels
+        run: |
+          nix-channel --add https://nixos.org/channels/${{ env.NIXPKGS_BRANCH }} nixpkgs
+          nix-channel --add https://github.com/LnL7/nix-darwin/archive/${{ env.NIX_DARWIN_BRANCH }}.tar.gz darwin
+          nix-channel --update
+      - name: Install nix-darwin
+        run: |
+          sudo mkdir -p /etc/nix-darwin
+          sudo chown $(id -nu):$(id -ng) /etc/nix-darwin
+          cd /etc/nix-darwin
+          curl -L -o configuration.nix https://raw.githubusercontent.com/LnL7/nix-darwin/master/modules/examples/simple.nix
+          nix run nix-darwin/nix-darwin-24.11#darwin-rebuild -- switch -I darwin-config=/etc/nix-darwin/configuration.nix
+
+      - name: Build nix-darwin configuration
+        run: darwin-rebuild build --flake '.#macbook'