DOC: Download example datasets before doc build (#2591)

Author: VeckoTheGecko

.readthedocs.yaml

@@ -13,6 +13,7 @@ build:
       - pixi install -e docs
     build:
       html:
+        - pixi run -e docs python ci/scripts/download-all-tutorial-datasets.py
         - pixi run -e docs sphinx-build -T -b html docs $READTHEDOCS_OUTPUT/html
 sphinx:
   configuration: docs/conf.py

ci/scripts/download-all-tutorial-datasets.py

@@ -0,0 +1,4 @@
+import parcels.tutorial
+
+for name in parcels.tutorial.list_datasets():
+    parcels.tutorial.open_dataset(name)