j4n 4fd0429cd3 docker: add Traefik support ...

USE_FOREIGN_CERT_MANAGER existed in compose/example.env but was never
read by any code. This wires it up end-to-end based on PR 662.

- Preliminarily add config options for this, and skip AcmetoolDeployer if
set.
- Add Traefik integration in docker/docker-compose-traefik.yaml, with
  traefik-certs-dumper
- post-hook.sh creates fullchain/privkey symlinks for chatmail
- Chatmail container uses ports 25/143/465/587/993 directly, Traefik
  handles 80/443
- docker/traefik/ contains config.yaml and dynamic configs
- docker/example-traefik.env for the Traefik setup
- rename USE_FOREIGN_CERT_MANAGER to CHATMAIL_NOACME

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..

dynamic-configs

docker: add Traefik support

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config.yaml

docker: add Traefik support

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post-hook.sh

docker: add Traefik support

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