allow setting readOnly on customStorage and limit permissionsmounts (#357)

* alles setting readOnly on customStorage

* update common version and example

* fix a typo

* Limit volume mounting for permission fix to relevant volumes.

library/common-test/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 kubeVersion: ">=1.16.0-0"
 name: common-test
-version: 2.1.3
+version: 2.1.4
 # upstream_version:
 appVersion: none
 description: Helper chart to test different use cases of the common library

library/common-test/values.yaml

@@ -55,7 +55,6 @@ additionalIngress:
     enabled: true
 
 # these values and names are set specifically with the unittests in mind.
-fixMountPermissions: false
 deviceMounts:
   test1:
     enabled: true