Use environment variables instead of output

[hf-krechan]

Description

The outputs are deprecated.

https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

It would be nice if the outputs are also stored as environment variables like in this GH Action https://github.com/docker/metadata-action/tree/v5.6.1/?tab=readme-ov-file#outputs

[crazy-max]

The outputs are deprecated.

https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

outputs are not deprecated, it's just using set-output that has been deprecated in favor of GITHUB_OUTPUT env var, not the feature itself.