CNTRLPLANE-1287: enable readOnlyRootFilesystem

[dusk125]

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[openshift-ci-robot]

@dusk125: This pull request references CNTRLPLANE-1287 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the sub-task to target the "4.20.0" version, but no target version was set.

In response to this:

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dusk125
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[openshift-ci]

@dusk125: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-ibmcloud-csi	d52de43	link	false	/test e2e-ibmcloud-csi
ci/prow/e2e-ibmcloud-csi-extended	d52de43	link	false	/test e2e-ibmcloud-csi-extended

Full PR test history. Your PR dashboard.

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[dusk125]

/hold
for proper testing in 4.21