Update ManagedIdentityCredential to use UAMI for containerapps

Author: 1yefuwang1

app/backend/app.py

@@ -419,6 +419,7 @@ async def setup_clients():
     AZURE_ENABLE_UNAUTHENTICATED_ACCESS = os.getenv("AZURE_ENABLE_UNAUTHENTICATED_ACCESS", "").lower() == "true"
     AZURE_SERVER_APP_ID = os.getenv("AZURE_SERVER_APP_ID")
     AZURE_SERVER_APP_SECRET = os.getenv("AZURE_SERVER_APP_SECRET")
+    AZURE_CLIENT_ID = os.getenv("AZURE_CLIENT_ID")
     AZURE_CLIENT_APP_ID = os.getenv("AZURE_CLIENT_APP_ID")
     AZURE_AUTH_TENANT_ID = os.getenv("AZURE_AUTH_TENANT_ID", AZURE_TENANT_ID)
 
@@ -449,7 +450,7 @@ async def setup_clients():
     azure_credential: Union[AzureDeveloperCliCredential, ManagedIdentityCredential]
     if RUNNING_ON_AZURE:
         current_app.logger.info("Setting up Azure credential using ManagedIdentityCredential")
-        azure_credential = ManagedIdentityCredential()
+        azure_credential = ManagedIdentityCredential() if AZURE_CLIENT_ID is None else ManagedIdentityCredential(client_id=AZURE_CLIENT_ID)
     elif AZURE_TENANT_ID:
         current_app.logger.info(
             "Setting up Azure credential using AzureDeveloperCliCredential with tenant_id %s", AZURE_TENANT_ID