MNT: Addition of ensemble variable to ECMWF dictionaries

Author: LUCKIN13

rocketpy/environment/weather_model_mapping.py

@@ -32,6 +32,7 @@ class WeatherModelMapping:
         "latitude": "latitude",
         "longitude": "longitude",
         "level": "level",
+        "ensemble": "number",
         "temperature": "t",
         "surface_geopotential_height": None,
         "geopotential_height": None,
@@ -44,6 +45,7 @@ class WeatherModelMapping:
         "latitude": "latitude",
         "longitude": "longitude",
         "level": "pressure_level",
+        "ensemble": "number",
         "temperature": "t",
         "surface_geopotential_height": None,
         "geopotential_height": None,