add more configurable options for pod template

[wey-gu]

During the tests of MEG friends, it's found there could be a conflict between nebulaCluster pods and istio-proxy sidecar pods, in order to disable the sidecar, below annotation fields are needed.

While for now, there is no such configuration interface to do so.

Is it feasible to add configurable options on this kind of k/v pairs via values.yaml ?

[veezhang]

@wey-gu Oh, Good idea!

[veezhang]

@wey-gu It's fix in #36

After merged, please configure 'nebula.podAnnotations.sidecar\.istio\.io/inject with false.

Notes:

• update the operator images
• update helm repo

  # If you have already added it, please skip.
  $ helm repo add nebula-operator https://vesoft-inc.github.io/nebula-operator/charts
  $ helm repo update

• re-install operator with --set 'image.nebulaOperator.imagePullPolicy'=Always

  # for example
  # image.nebulaOperator.imagePullPolicy'=Always is used for update the images
  $ helm uninstall nebula-operator --namespace nebula-operator-system
  $ kubectl delete crd nebulaclusters.apps.nebula-graph.io
  $ helm install nebula-operator ./charts/nebula-operator \          
      --namespace nebula-operator-system --create-namespace \
      --set 'image.nebulaOperator.imagePullPolicy'=Always

For example:

$ export NEBULA_CLUSTER_NAME=nebula           # the name for nebula cluster
$ export NEBULA_CLUSTER_NAMESPACE=nebula      # the namespace you want to install the nebula cluster
$ export STORAGE_CLASS_NAME=standard          # the storage class for the nebula cluster

$ helm install "${NEBULA_CLUSTER_NAME}" nebula-operator/nebula-cluster \
    --namespace="${NEBULA_CLUSTER_NAMESPACE}" --create-namespace\
    --set nameOverride=${NEBULA_CLUSTER_NAME} \
    --set nebula.storageClassName="${STORAGE_CLASS_NAME}" \
    --set-string 'nebula.podAnnotations.sidecar\.istio\.io/inject='false

$ kubectl get pod -n ${NEBULA_CLUSTER_NAMESPACE} -l app.kubernetes.io/cluster=${NEBULA_CLUSTER_NAME} \
    -o custom-columns='NAME:.metadata.name,Inject:.metadata.annotations.sidecar\.istio\.io/inject'
NAME                Inject
nebula-graphd-0     false
nebula-graphd-1     false
nebula-metad-0      false
nebula-metad-1      false
nebula-metad-2      false
nebula-storaged-0   false
nebula-storaged-2   false

[wey-gu]

@veezhang wow, thanks!!!