label overwrite does not works as expected

[sergey-safarov]

Behaviour

In the action description, you can read

If some OCI Image Format Specification labels generated are not suitable, you can overwrite them like this:

      -
        name: Docker meta
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: name/app
          labels: |
            maintainer=CrazyMax
            org.opencontainers.image.title=MyCustomTitle
            org.opencontainers.image.description=Another description
            org.opencontainers.image.vendor=MyCompany

Link
I want to overwrite org.opencontainers.image.source and specified

       labels: |
          org.opencontainers.image.source=https://github.com/sergey-safarov/kamailio-ci

In the build log, I can see present two labels with the same key org.opencontainers.image.source

Expected behaviour

Actions output should contain only one key/value pairs. And I am able to overwrite default keys.

Actual behaviour

The output contains multiple key/value pairs. Build actions take the first pair and I not able overwrite default values.

[crazy-max]

#125 (comment)

[crazy-max]

Maybe we could remove dupes to avoid confusion. Let me know if that would be good for you.

[sergey-safarov]

thanks @crazy-max, that will be optimal.