chore: adopt monolog config for staging environment from prod

config/packages/monolog.yaml

@@ -59,7 +59,7 @@ when@test:
                 path: "%kernel.logs_dir%/%kernel.environment%.log"
                 level: debug
 
-when@prod:
+when@prod: &prod_config
     monolog:
         handlers:
             database:
@@ -105,3 +105,5 @@ when@prod:
                 channels: [deprecation]
                 path: php://stderr
                 formatter: monolog.formatter.json
+
+when@staging: *prod_config