How to configure Rails & Docker app to use Angular?

Question

I have a very basic rails & docker app that I want to add Angular to, to handle all my frontend javascript. However, I can't seem to get Angular to work. I installed Angular via webpacker. As of now I only have the hello-angular files that come standard with rails 6 and webpack.

Dockerfile

FROM ruby:2.6

# Prerequisites
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && apt-get update -q && apt-get install -y nodejs yarn cron

# Cache Gems
WORKDIR /tmp

ADD Gemfile .
ADD Gemfile.lock .
RUN bundle install

# Copy App
WORKDIR /usr/bcb/app
ADD . /usr/bcb/app

# Precompile assets
RUN bin/yarn install
RUN bin/rails assets:precompile

# Expose port 3000 to other containers (Note: not external devices such as our workstation)
ENV PORT 3000
EXPOSE $PORT

# Run the built in Rails server (puma)
CMD ./docker-entrypoint.sh

# clean up APT
RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

docker-compose.yml

version: '3.3'

volumes:
  dbdata:
    driver: local

services:
  nginx:
    image: nginx
    ports:
      - '8080:80'
    volumes:
      - ./nginx/vhost.development.conf:/etc/nginx/conf.d/default.conf
    restart: always
    depends_on:
      - web

  db:
    image: postgres:11
    environment:
      - PGDATA=/var/lib/postgresql/data/pgdata
      - POSTGRES_USER=appuser
      - POSTGRES_PASSWORD=devdb
    volumes:
      - dbdata:/var/lib/postgresql/data/pgdata

  web:
    build: . # Builds the image from Dockerfile
    environment:
      WEBPACK_DEV_SERVER_HOST: webpack_dev_server
    links:
      - webpack_dev_server
    environment:
      - RAILS_ENV=development
      - RACK_ENV=development
      - POSTGRES_USER=appuser
      - POSTGRES_PASSWORD=devdb
    volumes:
      - .:/usr/bcb/app

    depends_on:
      - db

  webpack_dev_server:
    image: bcbapp_web
    command: ./bin/webpack-dev-server
    environment:
      NODE_ENV: development
      RAILS_ENV: development
      WEBPACK_DEV_SERVER_HOST: 0.0.0.0
    volumes:
      - .:/usr/bcb/app
    ports:
      - "3035:3035"

docker-entrypoint.sh

rm -f tmp/pids/server*.pid
bin/rails server -b 0.0.0.0 -p $PORT --pid tmp/pids/server.`hostname`.pid
bundle exec rake db:migrate RAILS_ENV=$environment 2>/dev/null || bundle exec rake db:create db:migrate

Here is my github repo: [1]: https://github.com/zacwillis/bcb

What am I missing?