• order
• var

order¶

https://docs.docker.com/compose/how-tos/startup-order/

services: [post]: build: . depends_on: [pre]

var¶

https://docs.docker.com/compose/how-tos/environment-variables/set-environment-variables/

services:
  webapp:

    environment:

    env_file: "filename.env"

Examples: https://docs.docker.com/compose/how-tos/environment-variables/envvars-precedence/#how-the-table-works - –env/-e (cli > host env > .env file ) > environment > env_file > Dockerfile ARG(build-time)/ENV