Implement Kubernetes Plugin

[Warashi]

What would you like to be added:

Support the Kubernetes platform in the plugin architecture.

TODO

• [x] deployment
  • [x] stages
    • [x] K8S_SYNC
      • [x] #5792
      • [x] add tests for using K8S_SYNC in the pipeline strategy
    • [x] K8S_ROLLBACK
      • [x] prune outdated, CANARY, and BASELINE resources
    • [x] K8S_PRIMARY_ROLLOUT
      • [x] #5791
      • [x] implement generatePrimaryManifests
      • [x] add tests
    • [x] K8S_BASELINE_ROLLOUT @Warashi
    • [x] K8S_BASELINE_CLEAN @Warashi
    • [x] K8S_CANARY_ROLLOUT @ffjlabo
    • [x] K8S_CANARY_CLEAN @ffjlabo
    • [x] K8S_TRAFFIC_ROUTING @Warashi
  • [x] traffic routing
    • [x] with pod selector
    • [x] with istio
  • [x] others
    • [x] implement checkVariantSelectorInWorkload
    • [x] support routing by Istio on K8S_PRIMARY_ROLLOUT (ref: pipedv0 logic https://github.com/pipe-cd/pipecd/blob/e1d78ff2e2c322c8f2b58c37a91fc9b614efdab1/pkg/app/piped/executor/kubernetes/primary.go#L57-L86)
• [ ] live states/drift detection
  • [x] basic live states
  • [ ] health status calculation (reference implementations: https://github.com/pipe-cd/pipecd/blob/fd2df12ede6375cc4932857ab1de7923b1d71d7d/pkg/app/piped/platformprovider/kubernetes/state.go#L66)
    • [x] Deployment
    • [ ] StatefulSet
    • [ ] DaemonSet
    • [ ] ReplicaSet
    • [ ] Pod
    • [ ] Job
    • [ ] CronJob
    • [ ] Service
    • [ ] Ingress
    • [ ] ConfigMap
    • [ ] PersistentVolume
    • [ ] PersistentVolumeClaim
    • [ ] Secret
    • [ ] ServiceAccount
    • [ ] Role
    • [ ] RoleBinding
    • [ ] ClusterRole
    • [ ] ClusterRoleBinding
    • [ ] NameSpace
    • [ ] PodDisruptionBudget
  • [x] basic drift detection / showing diffs
  • [x] ignore some fields when calculating drifts
• [x] others
  • [x] plan-preview
  • [x] loading manifests
    • [x] plain manifests
    • [x] remote helm chart
    • [x] local helm chart
    • [x] kustomize @Warashi

[aryasoni98]

Hello @Warashi

I’d love to be a part of this project and contribute. Looking forward to working together!

[ffjlabo]

updated the todos