diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
new file mode 100644
index 0000000..87de711
--- /dev/null
+++ b/.github/workflows/nix.yml
@@ -0,0 +1,15 @@
+name: Nix
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v20
+      - run: ./ci.sh
diff --git a/ci.sh b/ci.sh
new file mode 100755
index 0000000..5fc54dc
--- /dev/null
+++ b/ci.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+# Test that the flake-registry.json format is valid
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+nix run --flake-registry "$PWD/flake-registry.json" nixpkgs#hello