$ oc apply -f install/drain-cleaner/openshift                                     
namespace/strimzi-drain-cleaner created
serviceaccount/strimzi-drain-cleaner created
clusterrole.rbac.authorization.k8s.io/strimzi-drain-cleaner created
role.rbac.authorization.k8s.io/strimzi-drain-cleaner created
clusterrolebinding.rbac.authorization.k8s.io/strimzi-drain-cleaner created
rolebinding.rbac.authorization.k8s.io/strimzi-drain-cleaner created
service/strimzi-drain-cleaner created
validatingwebhookconfiguration.admissionregistration.k8s.io/strimzi-drain-cleaner created
error: error parsing install/drain-cleaner/openshift/060-Deployment.yaml: error converting YAML to JSON: yaml: line 29: mapping values are not allowed in this context 

apiVersion: apps/v1
kind: Deployment
metadata:
...
spec:
...
  template:
...
    spec:
...
      containers:
        - name: strimzi-drain-cleaner
          image: registry.redhat.io/amq-streams/drain-cleaner-rhel9:2.9.0
          ports:  <<-- !!! HERE !!!
            - containerPort: 8080
              name: http
            - containerPort: 8443
              name: https
          env:
            - name: STRIMZI_DRAIN_KAFKA
              value: "true"
            - name: STRIMZI_DRAIN_ZOOKEEPER
              value: "true"