[core] Add restart back

.env.example

@@ -70,6 +70,9 @@ WAHA_PRINT_QR=False
 # OR you can specify sessions by name, if you have handful amount of sessions
 #WHATSAPP_START_SESSION=session1,session2
 #
+# Restart all sessions when container starts
+# !!! Do not use it with multiple workers against one database !!!
+# WHATSAPP_RESTART_ALL_SESSIONS=True
 
 #
 # Swagger