Enhancement: option to save TF plan as a workflow artifact

[patheard]

Summary

Add an option that causes the action to save the .tfplan as a workflow artifact. This can then be used when the PR merges to main to test that the TF plan is still fresh and prevent unexpected infrastructure changes.

Related

• https://itnext.io/github-actions-terraform-deployments-with-a-review-of-planned-changes-30143358bb5c

[eehret]

This would be highly desirable, almost a must have. Right now I think there's a risk that by the time our PR merges, the outcome of the apply may differ from what was approved in the plan.

[patheard]

Yeah, there is definitely that risk of getting unexpected changes with a stale plan. Unfortunately (as you can see by the issue date on this) it has been hanging around for a while.

If you've got time, I'd be more than happy to review a PR that adds the behaviour!

[eehret]

Thanks @patheard . I can't make any promises as I've never authored a Github action before, but I'm certainly interested in helping out if I can. Will definitely send a PR your way if I manage to get something going! :)