解决方案（但请参见更新的解决方案）

version: "3"
services:

  backend:
    image: plone/plone-backend:6.0
    restart: always
    environment:
      ZEO_ADDRESS: zeo:8100
      SECURITY_POLICY_IMPLEMENTATION: "C"
      VERBOSE_SECURITY: "off"
      DEFAULT_ZPUBLISHER_ENCODING: "utf-8"
      DEBUG_MODE: "off"
      ZODB_CACHE_SIZE: "50000"
    tty: true
    stdin_open: true
    command: cat
    ports:
    - "8080:8080"
    depends_on:
      - zeo

  zeo:
    image: plone/plone-zeo:latest
    restart: always
    volumes:
      - data:/data
    ports:
    - "8100:8100"

volumes:
  data: {}

放入容器中：
$ docker-compose exec backend bash
然后运行：
$ gosu plone /app/bin/runwsgi -v etc/zope.ini config_file=zope.conf
这将在fg模式下启动示例。（http://0.0.0.0:8080/）
我在这里找到了这个：https://github.com/plone/plone-backend/issues/64#issuecomment-1211912408

更新（更好的解决方案）：

您可以将整个代码复制到您的docer-compose.yml中，并且您将获得作为注解的说明。

# CREATE PROJECT
# $ mkdir plone6
# $ cd plone6
# $ vim docker-compose.yml
#   Copy example from
#   https://6.docs.plone.org/install/containers/images/backend.html#example
#     Update: - data:/data
#       with: - ./data:/data
#
# START PLONE
# Stop all docker containers:
# $ docker stop $(docker ps -aq)
# $ docker-compose build
# $ sudo chown -R 500 data/
# $ docker-compose up
#
# ENTER THE BACKEND CONTAINER 
# $ docker-compose exec backend bash
#
# INSTALL VIM INTO CONTAINER
# $ apt update
# $ apt install vim
#
# FIND THE PACKAGES, EDIT (example plone.restapi)
# $ ./bin/python
# >>> import plone.restapi
# >>> plone.restapi.__file__
# '/app/lib/python3.11/site-packages/plone/restapi/__init__.py'
# >>> exit()
# $ vim /app/lib/python3.11/site-packages/plone/restapi/__init__.py
# To add a breakpoint write: import pdb; pdb.set_trace()
#
# START INSTANCE IN FG MODE
# In docker-compose.yml add for backend:
    # tty: true
    # stdin_open: true
    # command: cat
# docker-compose up
# docker-compose exec backend bash
# ./docker-entrypoint.sh
# set
# ./docker-entrypoint.sh start
version: "3"
services:

  backend:
    image: plone/plone-backend:6.0
    restart: always
    environment:
      ZEO_ADDRESS: zeo:8100
    tty: true
    stdin_open: true
    command: cat
    ports:
    - "8080:8080"
    depends_on:
      - zeo

  zeo:
    image: plone/plone-zeo:latest
    restart: always
    volumes:
      - ./data:/data
    ports:
    - "8100:8100"

volumes:
  data: {}