Recursive modules for linux

Author: mattmassicotte

Diff for: .github/workflows/ci.yml

@@ -43,6 +43,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
       - name: Install swiftly
         run: curl -L https://swiftlang.github.io/swiftly/swiftly-install.sh | bash -s -- -y
       - name: Install the latest Swift toolchain