add subpath value for grafana

Author: 7va

helm/templates/grafana/deployment.yaml

@@ -42,7 +42,7 @@ spec:
             - name: GF_SERVER_ROOT_URL
               value: "https://opensampl-test.ornl.gov/grafana"
             - name: GF_SERVER_SERVE_FROM_SUB_PATH
-              value: "true"
+              value: {{ .Values.grafana.serveFromSubPath | default "false" | quote }}
           readinessProbe:
             httpGet:
               path: /login