ci(release): create PR for versioned Makefile updates

[stackia]

Summary

• update the release workflow to create a PR for generated versioned Makefiles instead of pushing directly to main
• grant pull-requests write permission for the versioned job
• skip PR creation when generated files are already up to date

Checks

• ruby -e 'require "yaml"; YAML.load_file(".github/workflows/release.yaml"); puts "YAML OK"'
• git --no-pager diff --check -- .github/workflows/release.yaml

[github-actions]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Generate versioned Makefiles from the release tag

For release events where main has advanced past (or otherwise differs from) the published tag, this checks out the current main Makefiles but scripts/generate-versioned-makefiles.sh pins PKG_SOURCE_URL/PKG_HASH to the release tag tarball. That can create a PR whose OpenWrt build recipe expects files/rules from main while downloading the older tagged source, so the versioned Makefiles for that release may not build. The previous tag checkout kept the template and tarball in sync; keep generating from ${{ github.event.release.tag_name }} and push the resulting commit to a PR branch targeting main.

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[Copilot]

Pull request overview

This PR updates the release workflow so generated OpenWrt versioned Makefiles are proposed via a pull request instead of being pushed directly to main.

Changes:

• Adds pull request write permissions to the versioned release job.
• Checks out main, regenerates versioned Makefiles, and skips work if no diff exists.
• Creates or updates a release-specific PR branch and PR for generated Makefile updates.

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