j4n 2b12ed1ca1 ci: add Docker CI steps to staging workflows
Append Docker build-and-test steps to the existing split CI workflows
(test-and-deploy.yaml and test-and-deploy-ipv4only.yaml)

Each workflow now has:
- build-docker job: builds image with buildx, pushes to GHCR on push
- Docker deploy section stops bare services, installs Docker on VPS,
  copies ACME/DKIM to bind mounts, reuses chatmail.ini from bare-metal
  step, pulls GHCR image, starts container with docker compose
- Tests run inside container via `docker exec chatmail cmdeploy ...
  --ssh-host @local` — no CHATMAIL_DOCKER env var needed
- id: wait-for-vps added to VPS wait step for conditional guards

The build-docker and deploy jobs run independently.
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Chatmail relays for end-to-end encrypted email

Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed for:

  • Zero State: no private data or metadata collected, messages are auto-deleted, low disk usage

  • Instant/Realtime: sub-second message delivery, realtime P2P streaming, privacy-preserving Push Notifications for Apple, Google, and Huawei;

  • Security Enforcement: only strict TLS, DKIM and OpenPGP with minimized metadata accepted

  • Reliable Federation and Decentralization: No spam or IP reputation checks, federating depends on established IETF standards and protocols.

This repository contains everything needed to setup a ready-to-use chatmail relay on an ssh-reachable host. For getting started and more information please refer to the web version of this repositories' documentation at

https://chatmail.at/doc/relay

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