repronim-training --check-environment

[yarikoptic]

probably no the best repo to file issue against, but recording the idea to have a helper command to verify availability and compatibility of the components (e.g. datalad, singularity) used/needed by different training modules. Could be a quick check and ideally be capable of just running all scripted examples from the training materials (like we did half-manually for the datalad/reproin/glm lessons)