quotes in list inputs cause "Invalid Opening Quote"

[actualben]

Behaviour

When a list item value contains quotes, like the following label:

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: example
          labels: |
            org.opencontainers.image.description=this is a "good" example

The error: Error: Invalid Opening Quote: a quote is found inside a field at line 1 is produced. Previously this was touched on in #87 and as a result there was a change to build-push-action's input parsing. That didn't cover the case where the quote-containing value is an input to this action.

Does it make sense to add relax: true, to the input parsing in this action as well? If not, it probably makes sense to document the proper way to escape quotes somewhere in the metadata-action docs.

Steps to reproduce this issue

1. have a label or other list input item which contains quotation marks
2. run action

Expected behaviour

I'd expect there to be a documented way to have a label containing quotes.

Actual behaviour

Error: Invalid Opening Quote: a quote is found inside a field at line 1

Configuration

see yaml snippet in Behaviour section above

[crazy-max]

@actualben #153. Can you try with crazy-max/docker-metadata-action@preserve-quotes?

[actualben]

That fixed it! Thank you.

Before: https://github.com/backplane/conex/runs/4351586888?check_suite_focus=true
After: https://github.com/backplane/conex/runs/4353505568?check_suite_focus=true