Add github actions

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: "CI"
+on:
+  pull_request:
+  push:
+    branches: ["main"]
+jobs:
+  build:
+    name: Build packages
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - system: x86_64-linux
+    steps:
+    - uses: actions/checkout@v4
+    - uses: DeterminateSystems/nix-installer-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@main
+
+    - run: nix --print-build-logs build .#packages.$SYSTEM.default"
+      env:
+        SYSTEM: ${{ matrix.system }}