This is generally discouraged because of the waste of a pid (and its memory). Entry points should directly call to binaries.

As for the time of writing, the following cases of bash calls are present in the operator code:

pkg/ovncontroller/daemonset.go:                                                         "/bin/bash", "-c",
pkg/ovndbcluster/statefulset.go:        args := []string{"--single-child", "--", "/bin/bash", "-c"}