Seems to be the case for me as well. Fighting all morning trying to get a fix.
Edit:
Whats strange is if you stop the container you can get to the site, its just extremely slow. (cloudflare cache)
Another helpful error:
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/unicorn-5.5.1/lib/unicorn/socket_helper.rb:165:in
`bind': Cannot assign requested address - bind(2) for [::1]:3000 (Errno::EADDRNOTAVAIL)
/var/discourse# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ae2dac939415 local_discourse/app "/sbin/boot" 7 minutes ago Exited (5) 2 minutes ago app