In IBM Cloud managed environment due to missing serving cert volume mount, the operator is trying to create the cert in the tmp folder, but the readRootFileSystem is enabled so it can't do that. This causes the operator to fail with a /tmp readonly error.

4.21+

Always

    1.Use hypershift 4.21-rc-1 version and deploy a HostedCluster
    2.Check cluster-csi-snapshot-controller-operator pod logs 
   

    cluster-csi-snapshot-controller-operator pods in CrashLoopBackoff state

    cluster-csi-snapshot-controller-operator works properly, creating the serving cert

│ W0114 12:49:26.197738       1 cmd.go:257] Using insecure, self-signed certificates                                                                                │
│ F0114 12:49:26.198152       1 cmd.go:182] mkdir /tmp/serving-cert-824191421: read-only file system                                                                │
│ stream closed: EOF for openshift-cluster-storage-operator/csi-snapshot-controller-operator-8678c47545-6k59s (csi-snapshot-controller-operator)