Embedded cluster role to make podCreate working out of the box

[aballiet]

Feature description

Currently ones need to setup cluster role for Kestra in order to make it able to create Pods and stream execution logs.

We do it like this :

resource "kubernetes_cluster_role" "pod_creator" {
  metadata {
    name = "pod-creator"
  }

  rule {
    api_groups = [""]
    resources  = ["namespaces", "pods"]
    verbs      = ["get", "list", "watch", "create", "delete"]
  }
}

resource "kubernetes_cluster_role" "pod_log_reader" {
  metadata {
    name = "pod-log-reader"
  }

  rule {
    api_groups = [""]
    resources  = ["pods/log"]
    verbs      = ["get", "list"]
  }
}

resource "kubernetes_cluster_role" "pod_executor" {
  metadata {
    name = "pod-executor"
  }

  rule {
    api_groups = [""]
    resources  = ["pods/exec"]
    verbs      = ["get", "post"]
  }
}

resource "kubernetes_cluster_role_binding" "kestra_pod_creator" {
  metadata {
    name = "kestra-pod-creator"
  }
  role_ref {
    api_group = "rbac.authorization.k8s.io"
    kind      = "ClusterRole"
    name      = "pod-creator"
  }
  subject {
    kind      = "User"
    name      = "system:serviceaccount:kestra:default"
    namespace = "kestra"
  }
}

resource "kubernetes_cluster_role_binding" "kestra_pod_log_reader" {
  metadata {
    name = "kestra-pod-log-reader"
  }
  role_ref {
    api_group = "rbac.authorization.k8s.io"
    kind      = "ClusterRole"
    name      = "pod-log-reader"
  }
  subject {
    kind      = "User"
    name      = "system:serviceaccount:kestra:default"
    namespace = "kestra"
  }
}

resource "kubernetes_cluster_role_binding" "kestra_pod_executor" {
  metadata {
    name = "kestra-pod-executor"
  }
  role_ref {
    api_group = "rbac.authorization.k8s.io"
    kind      = "ClusterRole"
    name      = "pod-executor"
  }
  subject {
    kind      = "User"
    name      = "system:serviceaccount:kestra:default"
    namespace = "kestra"
  }
}

Whereas, it could be embedded directly in the Kestra helm chart using templating like Airbyte does here :

---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: {{ include "airbyte.serviceAccountName" . }}-role
rules:
  - apiGroups: ["*"]
    resources: ["jobs", "pods", "pods/log", "pods/exec", "pods/attach"]
    verbs: ["get", "list", "watch", "create", "update", "patch", "delete"] # over-permission for now
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: {{ include "airbyte.serviceAccountName" . }}-binding
roleRef:
  apiGroup: ""
  kind: Role
  name: {{ include "airbyte.serviceAccountName" . }}-role
subjects:
  - kind: ServiceAccount
    name: {{ include "airbyte.serviceAccountName" . }}
{{- end }}