* First pass at ephemeral env, new Docker ci target
* Add service checks, get public IP
* Separate issue_comment and workflow_run jobs
* Refactor workflows
* Adjust comment author association
* Checkout code
* Fix image name, manage service desired task count
* Use merge commit sha
* Fix IP output, add failure comment
* Refactor comment parsing & env spinup
* Check container image publish status
* Parse AWS account ID from registry URL
* Use PR number rather than variable merge commit SHA for image tag
* Fix docker push conditional
* Push multiple tags to ECR
* Fix comment author check
* Refactor comment body check
* Provision service with active task to get correct IP
* /testenv up
* Add @mentions to PR comments, env var cleanup
