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Dockerfiles and instructions how to use Docker to locally run ejabberd and the bots got added in the past to ease testing. After we did this, we however added Ansible code to provision a real host as a Pyrogenesis multiplayer lobby (https://github.com/0ad/lobby-infrastructure). This code can also be used to deploy a multiplayer lobby to a virtual machine utilizing Vagrant. The Ansible + Vagrant approach is much easier to use than the Docker setup to get a test environment running locally and resembles the real lobby setup much closer.
To avoid having to maintain two ways of how to run a local lobby for testing, this removes the setup for Docker and points users to the virtual machine approach.