Feedback on guides using CUE to validate Terraform plans

[myitcv]

Notes as of https://github.com/cue-labs/cue-by-example/blob/1c270cc8b8d6f63515fd0002bebbcb11e2118c7b/002_terraform_plan/README.md

Feedback kindly provided by @DavidGamba via Slack:

https://cuelang.slack.com/archives/CRJRL2X7F/p1697125830359419?thread_ts=1697042693.107549&cid=CRJRL2X7F

Given that this is a work assignment and not a personal project I am defaulting back to OPA/Rego.

A few key points:

1. (biggest one) The native atlantis integration with the policy_check rule. That rule seems configurable https://www.runatlantis.io/docs/policy-checking.html#running-policy-check-against-terraform-source-code but the team already uses opa elsewhere.
2. Linked to the above, atlantis uses conftest to run the policy checks. Any other tool integrating into that policy_check would need to build the same output.
3. Easy unit tests, which can be easily built with cue and a wrapper but having a built in unit test format makes things more cohesive.

Thanks for the help, I'll definitely try to dive deeper into policy checking with CUE in the future.