Adding a custom SPA (ember) Image

I have docker-compose override file with a custom node-based ember image shown below:
ui:
image: bang/ui-ember
hostname: ui
container_name: ui
build:
context: {HOST_PATH_HTTPD_DATADIR}/ui dockerfile: ui.Dockerfile environment: CI: "true" env_file: - ./.env networks: app_net: ipv4_address: 172.16.238.13 volumes: - {HOST_PATH_HTTPD_DATADIR}/ui:/bang-ui:rw${MOUNT_OPTIONS}
ports:
- “4200:4200”
- “35729:35729”
- “7357:7357”
depends_on:
- bind
- php
- httpd

Running docker-compose up gets everything up and running, except I’m stuck trying to figure out how to serve my running application. Without using an htdocs folder in my ui application, how do I serve my application?

Applicable configs in .env
NEW_UID=501
NEW_GID=20
TLD_SUFFIX=local
DEVILBOX_UI_SSL_CN=localhost,.localhost,devilbox,.devilbox,httpd,local,*.local
EXTRA_HOSTS=ui.local=172.16.236.13
PHP_SERVER=7.4
HTTPD_SERVER=nginx-stable
MYSQL_SERVER=percona-8.0