Checkout submodules in runner

.github/workflows/ci.yml

@@ -11,6 +11,8 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: "true"
 
       - name: Install just
         run: |
@@ -104,6 +106,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: "true"
 
       - name: Install build dependencies
         run: |
@@ -176,6 +180,8 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: "true"
 
       # Install Rust (adds cargo/rustc to PATH)
       - name: Install Rust (stable)