Support multiple actions in single README

[shakefu]

We have a use case where we'd like to support having multiple subdirectory actions output their docs to a single README at the top level. Right now action-docs only supports the single <!-- action-docs--... --> tags which means running it against multiple actions overwrites the previous generated action.

Right now multiple --action arguments generates an error (received array instead of string) and running action-docs multiple times with different --action arguments obviously overwrites the previous runs.

Is this something that could be supported?

[npalm]

Nice idea, feel free to raise a PR. I think the GitHub module is still one action per repostiroy, but happy to support the feature here.

[shakefu]

I think the GitHub module is still one action per repostiroy

Actually they point to their own CodeQL actions as an example of multi-action repositories. https://github.com/github/codeql-action

However the Action Marketplace doesn't support multi-action repositories yet. Still works great though.