runatlantis
Support `CI` and `ATLANTIS` native environment variables
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- [ ] I'd be willing to implement this feature (contributing guide)
Describe the user story
When executing tools or scripts in Custom Workflow, there are situations where you may want to confirm that they are “running in Atlantis.”
For example, other CI services provide environment variables such as the following, which can be used to determine the execution environment.
However, it does not exist in Atlantis. https://www.runatlantis.io/docs/custom-workflows#native-environment-variables
The github-comment tool identifies the execution environment based on these environment variables. https://suzuki-shunsuke.github.io/github-comment/complement
Describe the solution you'd like
This can be resolved by providing the environment variables CI=true and ATLANTIS=true as Native Environment Variables.
https://www.runatlantis.io/docs/custom-workflows#native-environment-variables
Describe the drawbacks of your solution
Currently, we are using ATLANTIS_TERRAFORM_VERSION for determination, but I don't think it's very appropriate. Because this variable is intended to store the Terraform version.
Describe alternatives you've considered
related issue: https://github.com/suzuki-shunsuke/go-ci-env/issues/583#issuecomment-3585492611
