The solution was pretty simple once I started thinking about it. 1. I need to define targets for

base

,

dev

, and

prod

a.

dev

will be used for

docker compose

and copy the application files to a new directory in the container. b.

prod

is for Pants/PEX and the binary is copied to the bin directory. 2. I need to mount the

./logger

directory to a place where my application files will live. 3. Specify which target

docker compose

should use. docker-compose.yaml

version: "3.8"
services:
  postgres:
    image: postgres:14.2-alpine
    restart: always
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    ports:
      - "5432:5432"
    volumes:
      - postgres:/var/lib/postgresql/data
  process:
    container_name: process
    build:
      context: ./process
      target: dev
    image: process
    depends_on:
      - postgres
    links:
      - postgres
    volumes:
      - ./logger:/app/logger
volumes:
  postgres:
    driver: local

process/Dockerfile

# syntax=docker/dockerfile:1

FROM python:3.9-slim AS base

FROM base AS dev

WORKDIR /app

COPY . .

ENV LOG_LEVEL=verbose

CMD [ "python3", "main.py" ]

FROM base AS prod

WORKDIR /bin

COPY ./main.pex app

ENV LOG_LEVEL=

CMD [ "app" ]

With this configuration I can use both

docker compose

and

./pants run process:docker