[WIP] Add notify job to sync workflow in GitHub Actions

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Context

A change was already implemented in the Geth generic repo that adds a Discord notification job to the sync workflow:
dappnode/DAppNodePackage-geth-generic@7552d5b

This same change needs to be applied to this repository.

Task

Add a new notify job at the END of the .github/workflows/sync.yml file.

The job to add is:

  notify:
    needs: sync
    if: always() && needs.sync.result != 'skipped'
    uses: dappnode/staker-test-util/.github/workflows/notify-discord.yml@main
    with:
      result: ${{ needs.sync.result }}
      test_type: "sync"
    secrets: inherit

Requirements

1. Open the file .github/workflows/sync.yml
2. Add the notify job at the END of the workflow file (after all existing jobs)
3. Do NOT modify any other jobs
4. Do NOT refactor workflow formatting
5. Do NOT reorder existing jobs
6. The notify job must depend on sync
7. Ensure indentation remains valid YAML

Branch and Commit

• Create branch: add-sync-notify-job
• Commit message: ci: add discord notify job to sync workflow
• Open PR to main
• Do NOT merge the PR

This pull request was created from Copilot chat.

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