Investigate deeper YAML checking

[heiskr]

According to https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-Readme.md there's a number of YAML tools installed on the Actions runners by default. We could investigate if these tools could offer more checks for learners.

[michelenoronha]

adorando aprender

[Patillareugh]

#3

[Patillareugh]

#`

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[Patillareugh]

Api

[hectorsector]

Thanks for the suggestion! Cleaning up the Skills issue list so I'm closing this out for now.