docs(deploy): add sandbox deploy runbook and recreate-relay script

[Ferryx349]

Description

Document the manual post-pull migrate and recreate flow, rollback steps, and /readyz verification. Closes the gap where the webhook pull stack loads images but does not restart the relay.

Related Issue

closes:- #767

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Non-functional change (docs, style, minor refactor)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my code changes.
• I added a changeset, or this is docs-only and I added an empty changeset.
• All new and existing tests passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: e781c91

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
nostream	Minor

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[greptile-apps]

Confidence Score: 5/5

[Low impact] The PR appears safe to merge, with a non-blocking gap in the HAProxy refresh instructions.

Findings

1.  Proxy settings stay old ▶

Summary

Adds a manual deploy runbook and a single-relay update script.

• Single-relay updates now run migrations and wait for readiness.
• Operators can follow one runbook to update or roll back relay hosts.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Load new image] --> B{Stack}
  B -->|Single relay| C[Run migrations]
  C --> D[Recreate relay]
  D --> E[Check readiness]
  B -->|HAProxy| F[Run migrations]
  F --> G[Replace backends one at a time]
  G --> E

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_{Reviews (3) · Last reviewed commit: "Merge branch 'main' into feat/deploy-run..." · Reviewed by Greptile}

[greptile-apps]

Proxy settings stay old

The refresh commands copy the new haproxy.cfg, but nothing reloads or recreates haproxy. The later commands replace only the relay backends. If a release changes proxy settings, operators following this runbook keep serving traffic with the old settings.

Add a config check and an explicit reload or recreate step, noting any downtime.