feat(helm): allow setting extra pod volumes via chart values (#744)

This adds the ability to set `extraVolumes` and `extraVolumeMounts` via
helm to the pod. It can be used to mount extra files, to persist files
inside the container or to allow usage of the CSI Secret Driver.
It does not introduce breaking changes since the default for both is
an empty array, so no volumes or volumeMounts are created when not
explicitly set.

Fixed #743

Signed-off-by: Henrik Gerdes <hegerdes@outlook.de>

chart/templates/daemonset.yaml

@@ -92,5 +92,13 @@ spec:
             {{- end }}
           resources:
             {{- toYaml $.Values.resources | nindent 12 }}
+          {{- with .Values.extraVolumeMounts }}
+          volumeMounts:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
       priorityClassName: system-cluster-critical
+      {{- with .Values.extraVolumes }}
+      volumes:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
 {{- end }}

chart/templates/deployment.yaml

@@ -100,5 +100,13 @@ spec:
             {{- end }}
           resources:
             {{- toYaml $.Values.resources | nindent 12 }}
+          {{- with .Values.extraVolumeMounts }}
+          volumeMounts:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
       priorityClassName: system-cluster-critical
+      {{- with .Values.extraVolumes }}
+      volumes:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
 {{- end }}

chart/values.yaml

@@ -120,3 +120,19 @@ robot:
 podLabels: {}
 
 podAnnotations: {}
+
+# Mounts the specified volume to the hcloud-cloud-controller-manager container.
+extraVolumeMounts: []
+# # Example
+# extraVolumeMounts:
+#   - name: token-volume
+#     readOnly: true
+#     mountPath: /var/run/secrets/hcloud
+
+# Adds extra volumes to the pod.
+extraVolumes: []
+# # Example
+# extraVolumes:
+#   - name: token-volume
+#     secret:
+#       secretName: hcloud-token