Add pulumi execution output to README

[rtrindvg]

Hello!

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Issue details

Today I am using the "comment-on-pr" action attribute to show the "pulumi preview" on each environment before approval/deploy. I am changing my workflow to use an IssueOps style of approval, creating a new Issue for the first deployment to me made, awaiting for a comment approving it, deploying and creating a new issue for the next environment and so on.

For this to work better, it would be nice to output the same content present on the "comment-on-pr" on the actions output sections. This would allow us to use this to enrich the issue with the preview execution, without the need to go to the pull request to check it.

After a brief discussion on the Slack channel it was suggested to open the feature suggestion here. I would gladly try to implement something but in an in the middle of a personal health crisis at this moment and won't be able to tackle this for at least the next 2 weeks. After this, if no PR suggestion is made I will try to address it.

Affected area/feature

Pulumi Actions

[justinvp]

Thanks for opening the issue and offer to work on it when you can!

[rtrindvg]

Actually, when I started working on the code, I noticed the feature is already there, just undocumented. It was implemented in https://github.com/pulumi/actions/pull/68.

I will adjust the title of this issue to add this information on the README file, although I would prefer not to open the PR, since I am not a native speaker.