ci: add discord notify job to sync workflow

[Copilot]

Adds Discord notification to the sync workflow to alert on job completion status.

Changes

• Added notify job to .github/workflows/sync.yml
• Job triggers after sync completes (success or failure, but not skipped)
• Calls reusable workflow dappnode/staker-test-util/.github/workflows/notify-discord.yml@main
• Passes sync result and test type parameters
• Inherits secrets for Discord webhook authentication

Implementation

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

This change aligns with the notification pattern already implemented in DAppNodePackage-geth-generic.

Original prompt

You need to apply the same GitHub Actions workflow change across multiple repositories.

Context

A change was already implemented in the Geth generic repo:

7552d5b

The change adds a new notify job at the end of .github/workflows/sync.yml.

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

Target repositories

Execution clients:

• https://github.com/dappnode/DAppNodePackage-reth-generic
• https://github.com/dappnode/DAppNodePackage-nethermind-generic
• https://github.com/dappnode/DAppNodePackage-besu-generic
• https://github.com/dappnode/DAppNodePackage-erigon-generic

Consensus clients:

• https://github.com/dappnode/DAppNodePackage-lighthouse-generic
• https://github.com/dappnode/DAppNodePackage-prysm-generic
• https://github.com/dappnode/DAppNodePackage-lodestar-generic
• https://github.com/dappnode/DAppNodePackage-teku-generic
• https://github.com/dappnode/DAppNodePackage-nimbus-generic

Requirements

For EACH repository:

1. Clone the repository.

2. Create a new branch:

   add-sync-notify-job
   

3. Open the file:

   .github/workflows/sync.yml
   

4. Add the notify job at the END of the workflow file.

5. Do not modify any other jobs.

6. Commit with message:

   ci: add discord notify job to sync workflow
   

7. Push the branch.

8. Open a Pull Request to main.

9. Do NOT merge the PR.

Important constraints

• Assume .github/workflows/sync.yml already exists in every repo.
• Do not refactor workflow formatting.
• Do not reorder jobs.
• Do not modify the existing sync job.
• The notify job must depend on sync.
• Ensure indentation remains valid YAML.

Expected output

Provide:

• A list of created PR URLs
• Confirmation that all repositories were updated
• Any repositories that failed (if applicable)

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