allow specifying the nodeSelector for the init jobs (#225)

* allow specifying the nodeSelector for the init jobs

* Use pulsar_metadata.nodeSelector

Co-authored-by: samuel <samuel.verstraete@aprimo.com>

### Motivation

When deploying pulsar to an AKS cluster with windows nodepools i was unable to specify that the Jobs of the initalize release had to run on linux nodes. With the change i can now specify a node selector for the init jobs.

### Modifications

add nodeSelector on pulsar_init and bookie_init

### Verifying this change

- [ ] Make sure that the change passes the CI checks.

charts/pulsar/templates/bookkeeper-cluster-initialize.yaml

@@ -37,6 +37,10 @@ spec:
     {{- if and .Values.rbac.enabled .Values.rbac.psp }}
       serviceAccountName: "{{ template "pulsar.fullname" . }}-{{ .Values.bookkeeper.component }}"
     {{- end }}
+      nodeSelector:
+      {{- if .Values.pulsar_metadata.nodeSelector }}
+{{ toYaml .Values.pulsar_metadata.nodeSelector | indent 8 }}
+      {{- end }}
       initContainers:
       - name: wait-zookeeper-ready
         image: "{{ template "pulsar.imageFullName" (dict "image" .Values.images.bookie "root" .) }}"

charts/pulsar/templates/pulsar-cluster-initialize.yaml

@@ -35,6 +35,10 @@ spec:
 {{- end }}
   template:
     spec:
+    {{- if .Values.pulsar_metadata.nodeSelector }}
+      nodeSelector:
+{{ toYaml .Values.pulsar_metadata.nodeSelector | indent 8 }}
+    {{- end }}
       initContainers:
       {{- if .Values.pulsar_metadata.configurationStore }}
       - name: wait-cs-ready
@@ -46,7 +50,6 @@ spec:
             until nslookup {{ .Values.pulsar_metadata.configurationStore}}; do
               sleep 3;
             done;
-
       {{- end }}
       - name: wait-zookeeper-ready
         image: "{{ template "pulsar.imageFullName" (dict "image" .Values.pulsar_metadata.image "root" .) }}"

charts/pulsar/values.yaml

@@ -644,6 +644,9 @@ pulsar_metadata:
   # configurationStore:
   configurationStoreMetadataPrefix: ""
   configurationStorePort: 2181
+  ## optional you can specify a nodeSelector for all init jobs (pulsar-init & bookkeeper-init)
+  # nodeSelector:
+    # cloud.google.com/gke-nodepool: default-pool
 
   ## optional, you can provide your own zookeeper metadata store for other components
   # to use this, you should explicit set components.zookeeper to false