Capture npm debug logs in Deploy To Artifacts workflow failures

[Copilot]

Deploy To Artifacts can fail during npm pack with Exit handler never called!, but current workflow output lacks npm debug logs needed to diagnose CI-only failures. This PR adds failure-path diagnostics so npm logs are visible in job output and preserved as artifacts.

• Build failure diagnostics

  • Added a failure-only step in deploy-to-artifacts.yml to enumerate and print all npm debug logs from ~/.npm/_logs into workflow output.
  • Handles missing logs gracefully (non-fatal message instead of masking the original failure).

• Artifact capture for investigation

  • Added a failure-only actions/upload-artifact@v4 step to upload ~/.npm/_logs/*.log as npm-debug-logs.
  • Uses if-no-files-found: warn so artifact upload does not hide root-cause failures.

- name: Show npm debug logs on failure
  if: failure()
  run: |
    shopt -s nullglob
    logs=("$HOME/.npm/_logs/"*.log)

    if [ ${#logs[@]} -eq 0 ]; then
      echo "No npm debug logs found in $HOME/.npm/_logs"
      exit 0
    fi

    for log in "${logs[@]}"; do
      echo "===== $log ====="
      cat "$log"
      echo
    done

- name: Upload npm debug logs artifact on failure
  if: failure()
  uses: actions/upload-artifact@v4
  with:
    name: npm-debug-logs
    path: ~/.npm/_logs/*.log
    if-no-files-found: warn