All environment values passed to 'mysql' service should be picked up from '.env' file. All these environment value should have default value, so if these values are not defined then the service will start with default settings. At this point docker-compose doesn't support setting default value for environment value. So wait until the feature is implemented.
All environment values passed to 'mysql' service should be picked up from '.env' file. All these environment value should have default value, so if these values are not defined then the service will start with default settings. At this point docker-compose doesn't support setting default value for environment value. So wait until the feature is implemented.