Make the upload_url available as an action output

[filiptronicek]

Hi there! 👋

It would be great to return the upload_url when a release is created (otherwise it could just be undefined), because it is often useful to be able to automatically upload artifacts. This is required with actions like https://github.com/actions/upload-release-asset.

[Andarist]

Do we know what's the size limit for github action's output? I can't find any info about this.

Given how we often create multiple releases per run - do you have any specific format of the value for this output in mind?

[filiptronicek]

Thanks for the quick response, @Andarist!

I think the upload_url could be provided in addition to other outputs queriable for the created release - there is an example of those values in the REST API docs. The upload_url shouldn't exceed any size constraints, I would imagine it similar to what the https://github.com/google-github-actions/release-please-action action does [their docs].

[Andarist]

I'm not that worried about a single upload_url exceeding the limit. Our action can create multiple GitHub releases at once when working with monorepos. So I wonder what would happen if we, let's say, create a hundred releases. We'd have to put 100 URLs in the output - so I wonder if that's OK or not.