build(ci): add .gitmodules mapping to fix mlx-swift-lm cloning failure in GitHub Actions

Author: solderzzc

.github/workflows/release.yml

@@ -31,6 +31,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0  # Full history for build number
+          submodules: recursive
 
       - name: Install Metal Toolchain
         run: xcodebuild -downloadComponent MetalToolchain || true

.gitmodules

@@ -1,4 +1,3 @@
 [submodule "mlx-swift-lm"]
 	path = mlx-swift-lm
 	url = https://github.com/SharpAI/mlx-swift-lm.git
-	branch = main