Checks that the GitHub Action workflow yml/yaml files adhere to the correct schema

nf-core pipelines use GitHub actions workflows to run CI tests, check formatting and also linting, among others. These workflows are defined by yml scripts in .github/workflows/. This lint test verifies that these scripts are valid by comparing them against the JSON schema for GitHub workflows.

To pass this test, make sure that all your workflows contain the required properties on and jobs and that all other properties are of the correct type, as specified in the schema (link above).