checkout with submodules

Author: mweibel

.github/workflows/release.yaml

@@ -11,6 +11,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+        with:
+          submodules: recursive
       - name: Build
         run: TAG=${GITHUB_REF_NAME} make release
       - name: Release