setup Gitlab runner namespace, service account and token for kubernetes

gitlab-runner.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: gitlab-managed-apps
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: gitlab-sa
  namespace: gitlab-managed-apps 
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: gitlab-role
  namespace: gitlab-managed-apps
rules:
- apiGroups:
  - ""
  - extensions
  resources:
  - '*'
  verbs:
  - '*'
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: gitlab-rb
  namespace: gitlab-managed-apps
subjects:
  - kind: ServiceAccount
    name: gitlab-sa
    namespace: gitlab-managed-apps
roleRef:
  kind: Role
  name: gitlab-role
  apiGroup: rbac.authorization.k8s.io
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: gitlab-cluster
  namespace: gitlab-managed-apps
subjects:
  - kind: ServiceAccount
    name: default
    namespace: gitlab-managed-apps
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: Secret
metadata:
  name: gitlab-secret
  namespace: gitlab-managed-apps
  annotations: 
    kubernetes.io/service-account.name: gitlab-sa
type: kubernetes.io/service-account-token