[WIP] upstream CI: Add support for multihost testing. #1010
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To be able to use a multihost testing environment, it is required that a domain with a server along with clients or replcas and clients be deployed. This environment is much more complex to obtain using the current CI infrastructure that uses molecule and containers, due to the need of more isolation between the testing nodes. By using Github actions, and Github's hosted macOS runner along with Vagrant to spawn multiple virtual hosts, it is possible to create an environment with a few virtual machines, that provided the required isolation. This setup allows for both deployment role testing, and multihost testing. The runner has to be a macOS runner due to Github restrictions on nested virtualization. The runner has support for Python 3, and the latest versio of ansible-core is installed through 'pip. This host has a 3-core vCPU, 14 GB of RAM and 14Gb of storage. The guests configuration are: * server.ipa.test: 2500 MB of RAM * rep-01.ipa.test: 2500 MB of RAM * cli-01.ipa.test: 768 MB of RAM All guests are deployed with the oficial Fedora 38 cloud-base image. Workflow steps are executed from '<repo>/tests/multihost' unless this is overriden with 'working-directory'. As Github sets the proper working directory only when 'run' is executed, the default directory is the repository root (e.g. setting 'working-directory: .' will set the working directory to the repository root). Although it is possible to change the working-directory, a different configuration has not been tested. The playbooks were created so that environment variables can be used to change the domain configuration. This can be used to create multiple parallel jobs in a test matrix. The default configuration installs a server with embedded DNS, a replica with no extra service, and a client.
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A playground to run deployment roles and multihost testing.