Correctly download llama.cpp submodule (#11)

Author: ferranpons

.github/workflows/publish-mavencentral.yml

@@ -13,6 +13,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          fetch-depth: 0
 
       - name: Select Xcode
         run: |