nf-core workflows create-test-yml

[adamrtalbot]

Description of feature

Fairly self explanatory, as of right now we have:

• nf-core modules create-test-yml
• nf-core subworkflows create-test-yml

We should complete the set with:

• nf-core workflows create-test-yml

This would roughly create a test for every workflow definition in a certain structure.

[adamrtalbot]

This might be easier to manage by grouping workflows for different executions, e.g.:

workflows/
    ├── default/
    │   ├── main.nf
    │   ├── nextflow.config
    │   └── test_default.yml
    ├── skip_qc/
    ├── skip_align/
    └── skip_x/

This is a little different to how Sarek does it but is more consistent with modules, subworkflows.

[mirpedrol]

closing as we have an issue to track adding pipeline level nf-test #2994