Update main.yml

Author: haskie-lambda

.github/workflows/main.yml

@@ -13,6 +13,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/[email protected]
+      with:
+        submodules: true
     - uses: cachix/install-nix-action@v13
       with:
         nix_path: nixpkgs=channel:nixos-20.03