Update GH Action, submodule approach

Author: bnubald

.github/workflows/actions.yaml

@@ -30,8 +30,9 @@ jobs:
           micromamba install -y -c conda-forge netcdf4=1.6.0
           eval "$(micromamba shell hook --shell bash)"
           micromamba activate base
-          git clone --recurse-submodules https://github.com/icenet-ai/icenet.git
+          git clone https://github.com/icenet-ai/icenet.git
           cd icenet
+          git submodule sync --recursive
           pip install .
           cd docs
           pip install -r requirements.txt