Not sure I fully understand your question; I know you have managed to successfully go through the
HTTP API wiki which is good to here. What you have done so far is run the demo docker compose profile; to move to the cloud you just need to create a suitable docker compose file that sets the appropriate environment variables (e.g. SETUP_ADMIN_PASSWORD, DOMAINNAME); just look at the comments at the top of the profile/demo.yml docker compose file.
Some knowledge of docker and docker compose is required.