feat(ci): Add missing Docker Hub credentials to help with rate limiting (#11165)

feat(ci): Add missing Docker Hub credentials to help with rate limiting

Co-authored-by: bruce.bujon <bruce.bujon@datadoghq.com>

Author: PerfectSlayer

.github/workflows/run-system-tests.yaml

@@ -77,6 +77,9 @@ jobs:
       excluded_scenarios: APM_TRACING_E2E_OTEL,APM_TRACING_E2E_SINGLE_SPAN,PROFILING  # exclude flaky scenarios
       skip_empty_scenarios: true
       push_to_test_optimization: true
+    secrets:
+      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
 
   # Ensure the main job is run to completion
   check: