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As far as expectations for 2 above, in my experience, teams really love having a completely separate environment per PR. Gitlab has done this on top of Kubernetes using a dynamic domain such as <truncated-branch-name>-review-app.domain.com. This gives QA and stakeholders the ability to easily review/signoff on changes prior to going live and not getting bottlenecked by a small number of QA/UAT environments. This becomes particularly helpful as the engineering team scales up.

For 2 - we would already have the time infra spun up via something like terraform. So we’d need to “adopt” the VPC/subnets from copilot. The actual connection details would be stored as env vars, but would need a “on create” hook to create the database for the environment.

Number 2 would attract an enormous amount of developers. Can you consider doing an example of such a workflow with copilot and pipelines, including provisioning a LB and/or tweaking an existing one to get per-branch subdomains with https?