PORTAINER_URL=Your_Portainer_Server_Adress (optional)
PORTAINER_API_KEY=Your_Portainer_API_Key (optional)
SUPERUSER_USERNAME=Your_Superuser_Username (optional)
SUPERUSER_EMAIL=Your_Superuser_Email (optional)
SUPERUSER_PASSWORD=Your_Superuser_Password (optional)
SELF_STACK_ID=Your_StackPulse_Stack_ID (optional)