Ok, in your dashboard, there will be a bunch of APIs listed but greyed out, these represent the forward proxy for your portal and will be accessible via port 80.
I am assuming you’ve managed to get an API to work, so all you need to do is fix the internal routing for the portal entries.
In the docker quickster, the portal is routed via the gateway, so the domain that is set as the target_url in each of the policy API Definitions needs to be the resolvable network name inside the Docker container / compose network.
Not really - docker has this annoying problem of renaming things internally on different architectures, you can try changing the hosts in those entries to be tykquickstart_tyk_dashboard_1, although the aliases defined in the compose file should also work (tyk_dashboard).