nf-core / nf-core/modules

Description

          and here's a username that doesn't exist... Ideally, we'd have a validation check on the modules `meta.yaml` (json schema + some custom checks) that validates such things.

### Tasks
- [x] #4173
- [ ] Check username exists
- [ ] List modules with no maintainers
- [ ] Don't run tests if meta.yml is modified

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