Set up distributed-parallel unit and smoke tests in CI?

[anyzelman]

(Would that be possible on GitHub?)

[anyzelman]

Update: this has been set up in GitLab, the related changes are already merged into develop. This requires CI runners that can select a docker image with LPF pre-installed. See the following locations for details:

• https://github.com/Algebraic-Programming/ReproducibleBuilds
• https://github.com/Algebraic-Programming/ALP/blob/develop/docs/Build_and_test_infra.md#the-coverage-infrastructure

There are no plans for setting up a similar infrastructure on the public GitHub-- if there are compelling reasons for doing so and the GitLab CI pipeline cannot be used, please feel free to reopen the issue.