feat: add git hash of build everywhere

backend/main.py

@@ -61,6 +61,7 @@ from config import (
     WEBHOOK_URL,
     ENABLE_ADMIN_EXPORT,
     AppConfig,
+    WEBUI_VERSION,
 )
 from constants import ERROR_MESSAGES
 
@@ -90,7 +91,8 @@ print(
       |_|                                               
 
       
-v{VERSION} - building the best open-source AI user interface.      
+v{VERSION} - building the best open-source AI user interface.
+{f"Commit: {WEBUI_VERSION}" if WEBUI_VERSION != "v1.0.0-alpha.100" else ""}
 https://github.com/open-webui/open-webui
 """
 )