What Are the Best Tools for Automatic Environment Updates on Every Push?

Short answer: Bunnyshell environments update automatically on every push to a PR branch — a Git webhook fires, Bunnyshell matches it to the ephemeral environment tracking that branch, and triggers a redeploy, with no CI configuration required on your side.

The Mechanism

bns environments update-settings --id <PRIMARY_ENV_ID> \
  --auto-deploy-ephemerals

Once set, every push to a tracked PR branch redeploys the corresponding ephemeral environment automatically. This is enforced at the Bunnyshell platform level, not something a workflow YAML file has to implement per repository.

Why It Stays Fast

A common concern: doesn't redeploying on every commit get slow and expensive? Bunnyshell's deploy pipeline only rebuilds components whose source actually changed — confirmed directly against a real pipeline, where a full 8-job initial deploy completed in 96 seconds:

1$ bns pipeline show --id OG7nYbkwM3
2Stages | Name  | Duration | Jobs | JobsDone | Status
3       | Stage | 1m36s    | 8    | 8        | success

A follow-up push touching only one component triggers a much smaller subset of those jobs, not all eight again.

The One Thing to Add Yourself

Since a new push redeploys mid-review, add a CI concurrency setting so an in-progress test run against the old code gets cancelled rather than reporting stale results:

1concurrency:
2  group: e2e-${{ github.event.pull_request.number }}
3  cancel-in-progress: true

For the full mechanics — including debugging a push that didn't trigger a redeploy — see Webhook-Triggered Environment Updates.