fix issue #15083 (#15109)

Signed-off-by: olivier beyler <olivier.beyler@orange.com>

stable/grafana/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: grafana
-version: 3.5.5
+version: 3.5.6
 appVersion: 6.2.4
 kubeVersion: "^1.8.0-0"
 description: The leading tool for querying and visualizing time series and metrics.

stable/grafana/templates/deployment.yaml

@@ -75,7 +75,8 @@ spec:
         - name: download-dashboards
           image: "{{ .Values.downloadDashboardsImage.repository }}:{{ .Values.downloadDashboardsImage.tag }}"
           imagePullPolicy: {{ .Values.downloadDashboardsImage.pullPolicy }}
-          command: ["sh", "/etc/grafana/download_dashboards.sh"]
+          "command": ["/bin/sh"],
+          "args": [ "-c", "mkdir -p /var/lib/grafana/dashboards/default", "/etc/grafana/download_dashboards.sh" ],
           volumeMounts:
             - name: config
               mountPath: "/etc/grafana/download_dashboards.sh"