firebase serve in docker works for functions but not hosting

I've already seen this issue: https://github.com/firebase/firebase-tools/issues/929 which adding the `-o` flag made it so functions would start working but hosting is still returning a `ERR_EMPTY_RESPONSE` from port 5000.

I've set up the following container Dockerfile:
FROM devillex/docker-firebase

ENV USER=app

RUN apt-get update && apt-get install -y openssl \
libssl-dev \
bash \
less \
vim \
gnupg \
curl \
net-tools \
apt-transport-https \
ca-certificates; \
CLOUD_SDK_REPO="cloud-sdk-$(grep VERSION_CODENAME /etc/os-release | cut -d '=' -f 2)" &&\
echo "deb https://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list &&\
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -; \
apt-get update && apt-get install -y \
google-cloud-sdk \
google-cloud-sdk-cloud-build-local &&\
gcloud config set project request-a-dance

RUN adduser --disabled-password --gecos "" --shell /bin/bash $USER &&\
mkdir /home/app/src &&\
npm install firebase-tools mocha standard

USER app
WORKDIR /home/app/src

EXPOSE 5000 5001 9005

With an accompanying docker-compose.yml file:

version: '3.3'
services:
firebase:
image: firebase:local
hostname: "firebase-local"
build:
context: ../..
dockerfile: docker/local/Dockerfile
volumes:
- ~/.config:/home/app/.config
- ~/.bash_aliases:/home/app/.bash_aliases:ro
- ~/.bashrc:/home/app/.bashrc:ro
- ../../src:/home/app/src/
ports:
- 5000:5080
- 5001:5001
- 9005:9005
tty: true

I ran through the `firebase init` process inside my container image and now I have the following file structure inside the `src` directory:

|- .firebase
|- .firebaserc
|- .gitignore
|- firebase-debug.log
|- firebase.json
|- firestore.indexes.json
|- firestore.rules
|- functions
|- index.js
|- node_modules
|- package.json
|- package-lock.json
|- public
|- index.html

I ran `firebase deploy` and when I visited the url for my hosted app, the browser returned the contents of `public/index.html`

However when I now run `firebase serve -o 0.0.0.0` inside the running docker container, requests to `0.0.0.0:5001` return:

// 20190920055855
// http://0.0.0.0:5001/

{
"status": "alive"
}

And here is the problem: requests to `0.0.0.0:5000` return to the browser:

This page isn’t working
0.0.0.0 didn’t send any data.
ERR_EMPTY_RESPONSE

I've read through other answers on stackoverlfow such as [https://stackoverflow.com/q/42764151/20178][1] but it seems like this should be an all or nothing deal, both hosting and functions should fail or work but not functions work while hosting fails.

I'm fairly certain that something is off within my `firebase.json` `hosting` config, but given that it works when deployed I'm not sure how that would be.

This issue is being cross posted from stackoverflow: https://stackoverflow.com/q/58028298/20178

[1]: https://stackoverflow.com/q/42764151/20178