Move model name to optional config and use deployment name if not present.

Author: timothymeyers

src/backend/config.py

@@ -36,7 +36,7 @@ class Config:
     COSMOSDB_CONTAINER = GetRequiredConfig("COSMOSDB_CONTAINER")
 
     AZURE_OPENAI_DEPLOYMENT_NAME = GetRequiredConfig("AZURE_OPENAI_DEPLOYMENT_NAME")
-    AZURE_OPENAI_MODEL_NAME = GetRequiredConfig("AZURE_OPENAI_MODEL_NAME")
+    AZURE_OPENAI_MODEL_NAME = GetOptionalConfig("AZURE_OPENAI_MODEL_NAME", default=AZURE_OPENAI_DEPLOYMENT_NAME)
     AZURE_OPENAI_API_VERSION = GetRequiredConfig("AZURE_OPENAI_API_VERSION")
     AZURE_OPENAI_ENDPOINT = GetRequiredConfig("AZURE_OPENAI_ENDPOINT")
     AZURE_OPENAI_API_KEY = GetOptionalConfig("AZURE_OPENAI_API_KEY")