Docker Compose to .env file

Extract .env file from an existing Docker Compose file

Docker Compose file:

Extract .env

# web
PORT=3000
DEBUG=true

# db
POSTGRES_USER=admin
POSTGRES_PASSWORD=secret

Updated Docker Compose:

services:
  web:
    environment:
      - PORT=${PORT}
      - DEBUG=${DEBUG}
  db:
    environment:
      - POSTGRES_USER=${POSTGRES_USER}
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}