diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
new file mode 100644
index 0000000..6ca58cc
--- /dev/null
+++ b/.github/workflows/cachix.yml
@@ -0,0 +1,17 @@
+name: "Build ci.nix and push to cachix"
+on:
+  pull_request:
+  push:
+jobs:
+  cachix:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.3.4
+    - uses: cachix/install-nix-action@v13
+      with:
+        nix_path: nixpkgs=channel:nixos-21.05
+    - uses: cachix/cachix-action@v10
+      with:
+        name: nix-on-droid
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+    - run: nix-build ci.nix