I've removed it from the .env file and added a randomly generated app secret to the docker entrypoint step to allow for it to be created dynamically on deployment. I don't know for certain if it will persist. Perhaps there's something more convoluted to docker hosting than I know, in which case a 500 error will appear complaining of a missing environment variable. If this happens we'll have to revisit this.
I've removed it from the .env file and added a randomly generated app secret to the docker entrypoint step to allow for it to be created dynamically on deployment. I don't know for certain if it will persist. Perhaps there's something more convoluted to docker hosting than I know, in which case a 500 error will appear complaining of a missing environment variable. If this happens we'll have to revisit this.