add ci.yml

Author: tstat

.github/workflows/ci.yml

@@ -0,0 +1,16 @@
+name: "CI"
+on:
+  pull_request:
+  push:
+jobs:
+  nix:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+    - uses: actions/checkout@v3
+    - uses: DeterminateSystems/nix-installer-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@main
+    - run: nix -L build "."