Checkout submodule

Author: termoshtt

.github/workflows/rust.yml

@@ -20,6 +20,8 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v1
+      with:
+        submodules: 'true'
     - uses: actions-rs/cargo@v1
       with:
         command: clippy