Upstream Fork Sync Automation

Create a cron automation that keeps a long-lived fork current with its upstream source. On every run it fetches the latest upstream changes, rebases the fork's local customizations on top, runs a verification check, and replaces the deployed version only when the software still works.

This implements the "long-lived fork" pattern: instead of repeatedly re-deriving a customization, the local changes are preserved across upstream releases and kept working automatically.

Windows PowerShell equivalents for the setup, packaging, upload, and API-check shell snippets are in references/windows.md.

Prerequisites

Required secret