fix: init submodules (also) in main CI job

Author: finalyards

.github/workflows/ci.yaml

@@ -13,6 +13,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Set up submodules
+        run: git submodule update --init --depth 1 --recursive
       - name: Free disk space
         run: |
           .ci/free_disk_space.sh