chore: Add cachix action for uploading binary cache artifacts (AztecP…

…rotocol/barretenberg#373)

* chore: Add cachix action for uploading binary cache artifacts

* Only run the nix action on master

* run on my branch and remove todos

* Remove running on my branch

barretenberg/.github/workflows/nix.yml

@@ -3,7 +3,7 @@ name: Nix builds
 on:
   push:
     branches:
-      - phated/**
+      - master
   schedule:
     - cron: "0 2 * * *" # run at 2 AM UTC
   workflow_dispatch:
@@ -32,6 +32,11 @@ jobs:
           nix_path: nixpkgs=channel:nixos-22.11
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
 
+      - uses: cachix/cachix-action@v12
+        with:
+          name: barretenberg
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
       - name: Check nix flake
         run: |
           nix flake check