Better RBAC defaults

[terinjokes]

While it will be impossible for us to define all the RBAC rules for any individual cluster, I think we should provide more reasonable defaults. I think the current recommendations run counter to what Faros should be promoting.

The simplest way to do this is to grant Faros cluster-admin, however, if you wish to be more secure, you can concatenate all rules from each Role and ClusterRole that Faros will manage.

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  creationTimestamp: null
  name: manager-role
rules:
- apiGroups:
  - '*'
  resources:
  - '*'
  verbs:
  - get
  - list
  - watch
  - create
  - update
  - patch
  - delete

[terinjokes]

I'm deploying Faros per namespace, which are used by individual product teams.The RBAC rules ends up looking like the following:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: faros
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: faros-rw
rules:
- apiGroups:
  - ""
  resources:
  - configmaps
  - endpoints
  - persistentvolumeclaims
  - pods
  - replicationcontrollers
  - replicationcontrollers/scale
  - secrets
  - serviceaccounts
  - services
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - ""
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - apps
  resources:
  - controllerrevisions
  - daemonsets
  - deployments
  - deployments/rollback
  - deployments/scale
  - replicasets
  - replicasets/scale
  - statefulsets
  - statefulsets/scale
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - autoscaling
  resources:
  - horizontalpodautoscalers
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - batch
  resources:
  - cronjobs
  - jobs
  - scheduledjobs
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - extensions
  resources:
  - daemonsets
  - deployments
  - deployments/rollback
  - deployments/scale
  - ingresses
  - replicasets
  - replicasets/scale
  - replicationcontrollers/scale
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - rbac.authorization.k8s.io
  resources:
  - rolebindings
  - roles
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - networking.k8s.io
  resources:
  - networkpolicies
  verbs:
  - create
  - delete
  - deletecollection
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - faros.pusher.com
  resources:
  - gittracks
  verbs:
  - get
  - list
  - watch
  - update
  - patch
- apiGroups:
  - faros.pusher.com
  resources:
  - gittrackobjects
  verbs:
  - get
  - list
  - watch
  - create
  - update
  - patch
  - delete
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: faros
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: faros
subjects:
- kind: ServiceAccount
  name: faros

The following cluster-level RBAC rules are required because of #138.

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: faros-ro
rules:
- apiGroups:
  - faros.pusher.com
  resources:
  - clustergittrackobjects
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: product-faros-ro
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: faros-ro
subjects:
- kind: ServiceAccount
  name: faros
  namespace: product