fix ci

.github/workflows/tests.yml

@@ -10,6 +10,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
       - run: sudo apt update && sudo apt install -y python3-mpi4py
+      - run: git submodule update --init --recursive
       - run: python -m pip install --user --upgrade setuptools pybind11 pytest
       - run: python -m pip install --user .
       - run: python -m pytest python/test -x

.github/workflows/wheels_cross_64bit.yml

@@ -9,6 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
+      - run: git submodule update --init --recursive
       - run: python -m pip install --user --upgrade cibuildwheel
       - run: python -m cibuildwheel --output-dir wheelhouse
         env:

.github/workflows/wheels_native_64bit.yml

@@ -9,6 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
+      - run: git submodule update --init --recursive
       - run: python -m pip install --user --upgrade cibuildwheel
       - run: python -m cibuildwheel --output-dir wheelhouse
         env: