Terraform Plan results displayed as GitHub PR comment

[marshall7m]

Have the PR plan and Deployment plan ECS tasks display the terraform plan results as a GitHub comment within the associated PR. The comment could be a diff code block that contains the plan. The reason for using the GitHub diff markdown is because diff blocks highlight lines that start with + as green and - as red which is similar to the annotation within Terraform plan outputs. It would be interesting to know if there's a way to incorporate color highlighting for ~ which represents modifications within terraform plans (maybe with terraform-j2md once issue is resolved)

PR Terraform plans

Possible formats could be:

A: All plans could be consolidated within one comment

• Each plan can be hidden via GitHub markdown drop downs
• Compacts PR so they aren't a bunch of comments to parse through

B: Each plan could be posted within its own comment

• Brings benefit of if a voter wants to comment in relation to the plan, they could "Quote reply" to the entire comment rather than specifying within their comment which PR plan they are referring to
• To mitigate the issue within option A, the comment could also use the drop-down feature

Execution Terraform plans

Possible formats could be:

A: Each plan could be posted within its own comment using the drop-down feature

• Have a markdown header that specifies that this plan is in relation to the execution flow and not the open PR plan

B: Same as option A but instead update the open PR plan comment

• Brings benefit of consolidating all plans in relation to one Terraform configuration within one comment
• Either could overwrite the open PR plan or create a separate drop-down plan below it that's labeled with the execution ID
• Would require ECS tasks to parse PR to match the plan with the existing comment

[marshall7m]

Resolved in PR #48