Feature request: check Github Action files too (not just Github Workflow files)

[lukaw3d]

https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-composite-action#creating-an-action-metadata-file

Naive implementation: lukaw3d@48e1ccc
I don't know if this conflicts with any other format; and it checks if inputs field exists, even tho it is optional

[mschuett]

implemented in the PR and released as part of v1.4.0