ci: Add nix-test

Author: pan93412

.github/workflows/nix-test.yml

@@ -0,0 +1,33 @@
+name: "nix-test"
+on:
+  pull_request:
+  push:
+    branches: [master]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  check-flakes:
+    strategy:
+      matrix:
+        os: [ubuntu-24.04, macos-14]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v27
+      - run: nix build .
+      - run: nix flake check
+
+  check-docker-x86-64:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v27
+      - run: nix build .#docker