@MoryCorp do you have any network config or firewalls that may be blocking your Ghost instance from making http(s) requests to it’s own configured url? I ask because we’ve seen that before with Docker setups and it will break AMP image support as well as scheduled posts.
It’s not necessarily a firewall, it could well be how your Docker container’s networking is set up. I’m not too familiar with Docker and it’s not our standard/supported setup so can’t really help too much on that side of things. If you’re not sure how to debug this perhaps someone from the community more familiar with Docker can help.