Add zero-downtime deployment scripts using Docker Swarm

gandalf_automationrequested to merge
add-swarm-deployment into develop

Summary

  • Update docker/docker-compose.yml for Swarm with order: start-first
  • Add scripts/deploy-swarm.sh for zero-downtime deploys
  • Add scripts/rollback-swarm.sh for quick rollback
  • Remove obsolete denser-auth service

Closes #783 (closed)

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