fix: Ensure submodules are checked out in the build workflow

Author: GeekMasher

.github/workflows/build.yml

@@ -19,6 +19,8 @@ jobs:
     steps:
       - name: "Checkout"
         uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: "Check for changes"
         uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36