Support list of labels

[sagikazarmark]

When the list of labels is long, it's not very easy to manage them in a single line and comma separation.

Many actions support lists of items like this:

-
        name: Docker meta
        id: meta
        uses: docker/metadata-action@v4
        with:
          # list of Docker images to use as base name for tags
          images: |
            name/app
            ghcr.io/username/app
          # generate Docker tags based on the following events/attributes
          tags: |
            type=schedule
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha

Adding support for labels like these would be nice. Thanks!

[mheap]

This is now available in @v5

[sagikazarmark]

Awesome, thanks!