docker compose with base image

# docker compose example

# usage
docker compose up

docker-compose.yml

version: "3"

services:
  base:
    image: base-image
    build:
      context: .
      dockerfile: ./Dockerfile
      target: base
    deploy:
      replicas: 0

  sub-with-build:
    build:
      context: .
      dockerfile: ./Dockerfile
      target: sub
    command: echo 'sub-with-build' && cat /bar.txt
    depends_on:
      - base

  sub-with-image:
    image: base-image
    command: echo 'sub-with-image' && cat /bar.txt
    depends_on:
      - base

Dockerfile

FROM alpine as base

RUN echo 'foo' > /foo.txt
RUN echo 'sleeping for 10s' && sleep 10


FROM base-image as sub

RUN echo 'bar' > /bar.txt && cat /foo.txt >> /bar.txt