Creates a new environment in the current app. The env starts in the no-pin state — promote (POST /v1/environments/{id}/promote) is the only path to pin a version. Synchronously provisions a per-env Fly app; failure rolls back the env row and surfaces 500 env_fly_provisioning_failed. Per FR-028 no API key is auto-minted; the response includes api_key_creation_url for the post-create CTA.
Documentation Index
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