Update README.md with instructions to run the builder server with sup… #4954

Job	Run time
Ensure all required Docker images exist on Dockerhub	9s
Detect Modified Files	7s
Frontend E2E Tests: Start EC2 Runner	1m 56s
Frontend: Start EC2 Runner	1m 41s
Platform: Start Build EC2 Runner	1m 20s
Platform: Start Helm Acceptance Test Runner	1m 41s
Platform: Build	14m 27s
Frontend: Build	6m 38s
Platform: Acceptance Tests (Helm)	1m 58s
Frontend: Run End-to-End Tests	18m 39s
Platform: Stop Helm Acceptance Test EC2 Runner	11s
Frontend: Stop Runner	9s
Notify Slack Channel on Build Failures	11s
Platform: Stop Build EC2 Runner	9s
Notify Slack Channel on Build Fixes	0s
Frontend E2E Tests: Stop Runner	11s
	49m 27s

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