feat: kubernetes deploy and real-time status update

[ghkdqhrbals]

Backend Implement

• Percentile & average calculator generic method
• MTTFB percentile value change to Long
• bm-agent now send AgentStatus.STOP event to bm-controller when stop is called
• Validation update with TemplateRequestDto
• Scheduler for catching high error rate, shutdown, response STOP_BY_ERROR event to bm-controller. It will start after 10s, period of 20s
• Parallel status check with the all agents (originally, sequential execution)
• Max agent status check timeout 30s to 10s

Kubernetes Implement

• bm-agent change to StatefulSet (originally Deployment)
• GCP egress 0.0.0.0/0 set, so you can run your performance test to every url
• spring-cloud-kubernetes-client to read pods ip related "bm-agent-service", listing, sending status request in every seconds
  • In a profile production, eureka discovery will be served
  • In a profile kubernetes, kubernetes discovery will be served
• RBAC setup (ClusterRole, serviceaccount, rolebinding ) attach to bm-controller deployment (because bm-controller need to run kubernetes API and get a auth to read services, pods)
• Ingress rule update
• img_push_multi_arch_local.sh added
• Issuer.yaml renewal, TLS setup with cert-manager

deploy url - https://www.high-load.org

Frontend Implement

• SockJS setup due to k8s service.yaml
• TESTING status will show loading image (or no image)
• Performance test's values will be shown as vertical table instead of horizontal single row
• Agent statusbar also show current testing templateId

[github-actions]

📝 Test code-coverage reports

File	Coverage [60.48%]	🍏
ErrorCode.java	100%	🍏
SystemSchedulerConst.java	100%	🍏
SseManageConsts.java	100%	🍏
PreftestConsts.java	100%	🍏
WebSocketConfig.java	100%	🍏
AgentStatus.java	100%	🍏
TestTemplateRequestDto.java	100%	🍏
ISseManageService.java	100%	🍏
ResultManagerService.java	100%	🍏
PerftestService.java	97.52%	🍏
RandomUtils.java	95.21%	🍏
AgentApiController.java	89.47%	🍏
Initializer.java	82.61%	🍏
ResultCalculator.java	80%	🍏
HttpSender.java	73.44%	🍏
PerftestController.java	72.95%	🍏
TestTemplateApiController.java	67.96%	🍏
SseManageService.java	45.45%	❌
DataLoaderKubernetes.java	0%	❌
DataLoader.java	0%	❌

Total Project Coverage	67.58%	🍏