Expose API during Docker deployment

I am running the esplora Docker image as per the README with the API port exposed:

```sh
$ docker run -p 50001:50001 -p 8094:80 -p 3000:3000 \
--volume $PWD/data_bitcoin_regtest:/data \
--rm -i -t -e blockstream/esplora bash -c "/srv/explorer/run.sh bitcoin-regtest explorer"
```

But in this configuration, there is no access to the API from the outside, which I would want. I have tried all kinds of hacks, but it seems there is no way to do this without creating a custom electrs Docker image? As per [this](https://bitcoin.stackexchange.com/questions/91746/configure-esplora-to-point-to-the-bitcoind-servers-ip-address/91859#91859) and [this issue](#339).

Accessing the API fails (it is set to 127.0.0.1:3000 instead of 0.0.0.0:3000, so understandable, but why not changeable?):
```sh
$ curl localhost:3000
curl: (56) Recv failure: Connection reset by peer
```

Trying access through the web interface just returns HTML:
```
$ curl http://localhost:8094/api/blocks/tip/
Bitcoin Regtest Explorer......
```

Any help would be appreciated. Is there an easy way to expose the API?