Route podcast sync updates through a PR instead of pushing to main

[Copilot]

The sync-podcast Actions job was failing after generating new episode files because it still tried to push directly to main, which is now blocked by repository rules. This change updates the workflow to publish synced podcast content through an automation PR instead of a protected-branch push.

• Workflow behavior

  • Replaced the inline git commit && git push step in podcast-sync.yml.
  • Added pull-requests: write so the workflow can open or update a PR with newly generated files under content/podcast.

• Automation path

  • Switched the job to peter-evans/create-pull-request.
  • Uses a stable automation branch (automation/sync-podcast) and preserves the existing sync commit/title semantics.

• Net effect

  • The sync job can continue generating new podcast episode content without violating branch protection.
  • New feed additions are surfaced for review via PR instead of being pushed straight to main.

- name: Create pull request for new episodes
  uses: peter-evans/create-pull-request@v8.1.1
  with:
    add-paths: |
      content/podcast
    branch: automation/sync-podcast
    commit-message: Sync new podcast episodes from feed
    title: Sync new podcast episodes from feed

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[Copilot]

Pull request overview

This PR updates the sync-podcast GitHub Actions workflow so podcast episode syncs are published via an automation pull request rather than pushing directly to the protected main branch.

Changes:

• Grants workflow permission to write pull requests (pull-requests: write).
• Replaces the inline git commit && git push logic with peter-evans/create-pull-request to open/update a PR for changes under content/podcast.