docker-compose_dev.yml

# Dev override: bind-mounts host source into backend/frontend so edits are
# live without `docker cp` or image rebuilds.
#
# This is an override, never a standalone stack -- it only declares extra
# `volumes`. Layer it on top of a base file with a second -f. It works with
# either base:
#   docker compose -f docker-compose_build.yml -f docker-compose_dev.yml up -d
#   docker compose -f docker-compose.yml       -f docker-compose_dev.yml up -d
# The first builds the image from local source; the second uses the released
# Docker Hub image. Either way, this file makes the running source live.
#
# How the volume merge works: Compose concatenates the `volumes` lists from
# both files. The `.:/usr/src/app` mount declared here is the broad source
# mount; the base file's mounts for /usr/src/app/{data,config,logs} (named
# volumes or host dirs, depending on the base) are more specific paths and
# still win on those subtrees, so data/config/logs keep their own storage
# instead of being shadowed by the broad source mount.
#
# The anonymous volume on `/usr/src/app/fourcat.egg-info` preserves the
# container's `pip install -e .` metadata so the source mount doesn't shadow
# it with an empty (or stale) host directory.

services:
  backend:
    volumes:
      - .:/usr/src/app
      - /usr/src/app/fourcat.egg-info

  frontend:
    volumes:
      - .:/usr/src/app
      - /usr/src/app/fourcat.egg-info