add stratification to satisfy pydantic

Author: jonasbhend

config/showcase.yaml

@@ -31,6 +31,16 @@ baselines:
       root: /store_new/mch/msopr/ml/COSMO-E
       steps: 0/120/6
 
+stratification:
+  regions:
+    - jura
+    - mittelland
+    - voralpen
+    - alpennordhang
+    - innerealpentaeler
+    - alpensuedseite
+  root: /scratch/mch/bhendj/regions/Prognoseregionen_LV95_20220517
+
 analysis:
   label: COSMO KENDA
   analysis_zarr: /scratch/mch/fzanetta/data/anemoi/datasets/mch-co2-an-archive-0p02-2015-2020-6h-v3-pl13.zarr