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Give each opted-in pull request (PR) its own reviewable deployment, update that deployment as commits arrive, and delete its resources when the PR is no longer eligible. GitHub Actions can coordinate the workflow and control access to secrets; a hosting provider or infrastructure API must create and remove the actual application environment.
How do I create a preview environment for each pull request?
Use a stable identity for each preview—commonly a name derived from the PR number, such as preview-pr-42. This is an implementation pattern, not a GitHub requirement. The identity lets deployment and cleanup jobs find the same resources instead of creating duplicates or deleting the wrong preview.
A preview environment is a deployed version of the proposed change that reviewers can inspect separately from production. Hosting platforms such as Vercel and Netlify document PR-connected preview deployments and unique deployment URLs. With a custom setup, your workflow calls the chosen provider or infrastructure API to provision the application, configure its URL, and report that URL on the PR.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsA GitHub Actions environment is not the application environment itself. It is a workflow control and tracking mechanism: it can apply deployment protection rules and control access to environment secrets, but it does not provision servers, databases, domains, or containers. Those actions belong to your hosting provider or infrastructure tooling.
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Choose integrated hosting or custom infrastructure
| Approach | What it handles | What your team must design |
|---|---|---|
| Integrated hosting | Repository-connected preview deployments and unique URLs are documented by providers such as Vercel and Netlify. | Confirm how the provider handles your desired opt-in signal, access controls, secrets, updates, and deletion of related resources. |
| Custom GitHub Actions workflow | GitHub Actions runs jobs in response to configured events and can use deployment environments for controls and tracking. | Choose and call the infrastructure provider; implement provisioning, URL reporting, update behavior, permissions, and teardown. |
Compare options against your actual needs: PR-label opt-in, isolation between PRs, preview access protection, handling of fork or otherwise untrusted contributions, update and concurrency behavior, cleanup of databases and attached storage, deployment history, token permissions, and operational effort. Verify current provider pricing and retention terms directly; they are not established here.
How do I deploy a preview when I add a PR label?
Make the label an explicit opt-in rather than deploying every PR by default. For example, use an allowlisted label named preview. Keep the trigger narrowly scoped: confirm that the event is a label application, the label is on the allowlist, and the PR comes from the intended repository and targets an approved base branch.
- Choose the signal. Decide which label or labels authorize a preview, who may apply them, and which base branches qualify.
- Configure the workflow trigger. Use GitHub Actions to react to the appropriate PR-label event, then filter for the allowlisted label and eligible PR. Check GitHub’s current event reference for the exact event and filter syntax before implementing it; a label event is not interchangeable with a push or general PR event.
- Provision under the PR’s stable identity. Have the hosting or infrastructure operation create or update the preview associated with that PR. Deploy the PR head revision or the merge revision your provider is designed to deploy, and make that choice consistent.
- Publish the result. Post the preview URL to the PR so reviewers can find it. Update the PR’s status or comment when a deployment fails rather than presenting an old URL as the result of the latest commit.
Provider integrations differ in which events they handle automatically and how they expose preview variables or URLs. Confirm those details in the provider’s current documentation instead of assuming that adding a GitHub Actions environment creates the deployment.
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Subsequent commits should update the preview tied to the same PR identity. Provisioning and update operations should be idempotent: running them again for the same PR should converge on one current preview rather than leave duplicate applications or resources behind.
Serialize deployment work per PR with a concurrency group based on that PR’s identity. This reduces the chance that rapid pushes cause a stale run to overwrite a newer deployment or that the URL reported on the PR no longer matches the deployed revision. GitHub documents concurrency and deployment environments as separate mechanisms; naming an environment does not itself serialize runs.
Before enabling cancellation of an in-progress run, check how it interacts with your deployment tool. A cancelled job may have started provisioning without finishing, so the provider operation should tolerate retries and the workflow should not leave partially created resources untracked. Before publishing a URL, verify that the run is still acting on the PR’s current eligible state.
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How do I keep preview deployments from using production secrets?
Assume that code under review may be untrusted. Limit each workflow job to the permissions it needs, and keep preview credentials and data separate from production. Do not pass production credentials or sensitive production data into a build of contribution code.
- Use dedicated non-production credentials with only the access needed to deploy and operate previews.
- Keep preview data separate; do not populate a preview with sensitive production data merely to make it look realistic.
- Use a GitHub Actions deployment environment when you need protection rules, such as required approval, a delay, or branch restrictions. Jobs that access environment secrets wait for the applicable protection rules to pass.
- Treat environment secrets with the same care as repository and organization secrets. A deployment environment is an access-control and tracking feature, not a sandbox that makes untrusted code safe.
Review which events can access credentials, which revisions a job checks out, and which permissions its token receives. Keep secrets out of any build or execution path that can run untrusted PR code.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do I delete a preview environment when a pull request closes?
Make teardown a deliberate workflow path, not an assumption that a preview expires automatically. Choose the condition that ends preview eligibility: label removal, PR closure, or both. If merged PRs should not retain previews, include merged PRs in the closed-PR cleanup path.
- Trigger cleanup on the chosen end condition. Configure a workflow for label removal and/or PR closure according to your policy. A closed PR includes both merged and unmerged outcomes, so decide explicitly whether either should retain a preview.
- Resolve the same stable identity used to deploy. Use the PR-derived key to target the corresponding application and associated resources.
- Call the provider’s delete operation. Remove the preview infrastructure through the provider or API that created it. Make deletion safe to retry so a repeated cleanup event does not cause an unsafe failure.
- Report the outcome. Record success or failure on the PR or in the workflow log. Retain enough deployment history to investigate problems without leaving the preview URL operational.
Check the provider’s deletion behavior for each resource you created. Removing an application may not also remove its deployment record, domain, database, or attached storage. A scheduled reconciliation job that finds resources whose PRs are no longer eligible can help detect orphans, but its resource-discovery and deletion logic must be designed for your provider.
Quick Recap
What should I verify before enabling the workflow?
- Only the intended repositories, base branches, and allowlisted labels can opt in.
- Each PR maps to one stable preview identity, and a later commit updates it rather than creating another resource.
- Deployment work is serialized appropriately per PR, and cancelled or failed runs do not silently strand resources or publish stale URLs.
- Preview jobs use least-privilege permissions, separate non-production credentials and data, and any required environment protection rules.
- Label removal and PR closure reach the correct provider-specific delete operation; merged PRs follow the intended retention policy.
- Cleanup covers related resources, reports failures, and can be safely retried.
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