introduce a mechanism for relearning the aggregator certificate #27

Job	Run time
Check code format / build	20s
Bandit Code Scan / Bandit Scan	37s
Docker Bench for Security / build	42s
Federated Runtime 301 MNIST Watermarking / test_federated_runtime_301_watermarking_notebook	8m 46s
Double workspace export / build	3m 30s
Hadolint Security Scan / build	54s
GaNDLF TaskRunner / build	3m 42s
Private Key Infrastructure / test_insecure_client	1m 1s
Pytest and code coverage / build	1m 48s
Straggler Handling Test / build (ubuntu-latest)	3m 17s
TaskRunner / build	3m 55s
TaskRunner (Eden Compression) / build	0s
Straggler Handling Test / build (windows-latest)	4m 31s
TaskRunner (docker/gramine-direct) / build	7m 31s
TaskRunner (docker/native) / build	5m 20s
Trivy Scan / Build	5m 0s
Workflow Functional E2E / wf_functional_local_runtime (3.10)	2m 32s
Workflow Interface 101 MNIST Notebook / wf_local_101_mnist	7m 19s
Workflow Interface Tests / build	0s
Pipeline Status	1s
	1h 0m 46s

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