Connection refused for docker container

Hello! Trying to use your service, builded docker image from latest code. (as pulling mpwsh/imgopt:0.2.1 is not available)

docker run --rm -p 3030:3030 imgopt

but getting Connection refused for any url, ie: server_ip:3030/ipfs/bafybeih26pot7dyvqkjabsx75fuypf6cy6derd6tojnfpctja75a2j7uk4?width=600

[2023-01-12T11:30:09Z DEBUG actix_web::middleware::logger] Error in response: Connect(Io(Os { code: 111, kind: ConnectionRefused, message: "Connection refused" }))

Start by reproducing the issue with `docker run --rm -p 3030:3030 imgopt` and inspect the container logs while requesting the shown `/ipfs/...` URL. Check whether the service is reachable through the published port and determine why the request ends with connection refused; done means the documented request returns successfully from the container.

Written by the indexing model from the issue text.