Update nightly-build.yml to automatically merge changes from development
branch to nightly before running the build. This enables a workflow where
PRs only need to target development, and nightly builds propagate
automatically.
Add sync-development-to-nightly job that runs first
Remove push trigger on nightly branch (sync handles updates)
All jobs now explicitly checkout nightly branch after sync
Uses fast-forward merge or hard reset if diverged
GitHub Actions
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