Status: there's been some downtime due to server resources. It has now been fixed. We're growing faster than expected. I'll do some maintenance tomorrow to future-proof things.
It seems we're growing faster than expected and the server needed to be expanded a bit. Apologies.
Tomorrow I'll dedicate some time to have this better monitored so we don't hit the wall and can scale earlier.
Thank you and apologies for the downtime!
Update: one of the docker containers ended up as a zombie and I had to manually kill a file to make it work again. Image uploading works again.