Issues `Operator Couldn't start source ...` with Integration Tests

[csviri]

This is randomly happening with Github Actions.
see:
https://github.com/java-operator-sdk/java-operator-sdk/runs/5645783752?check_suite_focus=true

Error:  Errors: 
Error:    EventSourceIT.receivingPeriodicEvents » Operator Couldn't start source io.java...

[csviri]

2022-03-22T14:32:55.6785928Z 2022-03-22 14:32:55,617 1 i.f.k.c.Config                 [DEBUG] Trying to configure client from Kubernetes config...
2022-03-22T14:32:55.6786835Z 2022-03-22 14:32:55,617 1 i.f.k.c.Config                 [DEBUG] Found for Kubernetes config at: [/home/runner/.kube/config].
2022-03-22T14:33:00.9047424Z 2022-03-22 14:32:55,678 1 i.j.o.j.AbstractOperatorExtension [INFO ] Initializing integration test in namespace eventsourceit-receivingperiodicevents-099d30ce-decb-4e51-a8ac-3
2022-03-22T14:33:00.9050346Z 2022-03-22 14:32:55,705 1 Default ConfigurationService implementation [WARN ] Configuration for reconciler 'eventsourcetestcustomreconciler' was not found. Known reconcilers: testreconciler, customfilteringtestreconciler, deploymentreconciler, observedgenerationtestreconciler, maxintervaltestreconciler, cleanerformanageddependenttestreconciler, multiversioncrdtestreconciler2, multiversioncrdtestreconciler1, informereventsourcetestcustomreconciler, errorstatushandlertestreconciler, doubleupdatetestcustomreconciler, cleanerforreconcilertestreconciler.
2022-03-22T14:33:00.9052794Z 2022-03-22 14:32:55,705 1 Default ConfigurationService implementation [INFO ] Created configuration for reconciler io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomReconciler with name eventsourcetestcustomreconciler
2022-03-22T14:33:00.9054224Z 2022-03-22 14:32:55,713 190 i.f.k.c.i.i.DefaultSharedIndexInformer [DEBUG] informer: ready to run resync and reflector for class io.fabric8.kubernetes.api.model.apiextensions.v1.CustomResourceDefinition with resync 0
2022-03-22T14:33:00.9055574Z 2022-03-22 14:32:55,713 190 i.f.k.c.i.i.DefaultSharedIndexInformer [DEBUG] informer#Controller: resync skipped due to 0 full resync period class io.fabric8.kubernetes.api.model.apiextensions.v1.CustomResourceDefinition
2022-03-22T14:33:00.9056720Z 2022-03-22 14:32:55,718 190 i.f.k.c.i.r.Readiness          [WARN ] CustomResourceDefinition is not a Readiable resource. It needs to be one of [Node, Deployment, ReplicaSet, StatefulSet, Pod, ReplicationController]
2022-03-22T14:33:00.9057871Z 2022-03-22 14:32:55,718 190 i.f.k.c.i.c.Reflector          [DEBUG] Listing items (1) for resource class io.fabric8.kubernetes.api.model.apiextensions.v1.CustomResourceDefinition v1219
2022-03-22T14:33:00.9058989Z 2022-03-22 14:32:55,718 1 i.j.o.j.OperatorExtension      [DEBUG] Applied CRD with name: eventsourcesamples.sample.javaoperatorsdk
2022-03-22T14:33:00.9061011Z 2022-03-22 14:32:55,719 1 i.j.o.p.e.s.i.InformerManager  [DEBUG] Registered io.javaoperatorsdk.operator.processing.event.source.informer.InformerManager@743c3520 -> io.javaoperatorsdk.operator.processing.event.source.informer.InformerWrapper@6842c101 for namespace: eventsourceit-receivingperiodicevents-099d30ce-decb-4e51-a8ac-3
2022-03-22T14:33:00.9062614Z 2022-03-22 14:32:55,719 1 i.j.o.a.c.ExecutorServiceManager [DEBUG] Initialized ExecutorServiceManager executor: class java.util.concurrent.ThreadPoolExecutor, timeout: 10
2022-03-22T14:33:00.9063603Z 2022-03-22 14:32:55,719 1 i.j.o.a.c.ExecutorServiceManager [DEBUG] Initialized ExecutorServiceManager executor: class java.util.concurrent.ThreadPoolExecutor, timeout: 10
2022-03-22T14:33:00.9065173Z 2022-03-22 14:32:55,719 1 i.j.o.Operator                 [INFO ] Registered reconciler: 'eventsourcetestcustomreconciler' for resource: 'class io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomResource' for namespace(s): [eventsourceit-receivingperiodicevents-099d30ce-decb-4e51-a8ac-3]
2022-03-22T14:33:00.9066487Z 2022-03-22 14:32:55,719 1 i.j.o.j.OperatorExtension      [DEBUG] Starting the operator locally
2022-03-22T14:33:00.9067429Z 2022-03-22 14:32:55,719 1 i.j.o.Operator                 [INFO ] Operator SDK 3.0.0-SNAPSHOT (commit: 1285874) built on 2022-03-22T14:30:42.000+0000 starting...
2022-03-22T14:33:00.9068258Z 2022-03-22 14:32:55,719 1 i.j.o.Operator                 [INFO ] Client version: 5.12.0
2022-03-22T14:33:00.9068924Z 2022-03-22 14:32:55,719 1 i.j.o.a.c.ExecutorServiceManager [DEBUG] Already started, reusing already setup instance!
2022-03-22T14:33:00.9070223Z 2022-03-22 14:32:55,719 1 i.j.o.p.Controller             [INFO ] Starting 'eventsourcetestcustomreconciler' controller for reconciler: io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomReconciler, resource: io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomResource
2022-03-22T14:33:00.9071555Z 2022-03-22 14:32:55,719 1 i.j.o.p.e.EventSourceManager   [DEBUG] Starting event source io.javaoperatorsdk.operator.processing.event.source.timer.TimerEventSource
2022-03-22T14:33:00.9072665Z 2022-03-22 14:32:55,719 1 i.j.o.p.e.EventSourceManager   [DEBUG] Started event source io.javaoperatorsdk.operator.processing.event.source.timer.TimerEventSource
2022-03-22T14:33:00.9074358Z 2022-03-22 14:32:55,719 1 i.j.o.p.e.EventSourceManager   [DEBUG] Starting event source io.javaoperatorsdk.operator.processing.event.source.controller.ControllerResourceEventSource for class io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomResource
2022-03-22T14:33:00.9075931Z 2022-03-22 14:32:55,719 1 i.f.k.c.i.i.DefaultSharedIndexInformer [DEBUG] informer: ready to run resync and reflector for class io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomResource with resync 0
2022-03-22T14:33:00.9077711Z 2022-03-22 14:32:55,719 1 i.f.k.c.i.i.DefaultSharedIndexInformer [DEBUG] informer#Controller: resync skipped due to 0 full resync period class io.javaoperatorsdk.operator.sample.event.EventSourceTestCustomResource
2022-03-22T14:33:00.9078821Z 2022-03-22 14:32:55,726 1 i.j.o.j.AbstractOperatorExtension [INFO ] Deleting namespace eventsourceit-receivingperiodicevents-099d30ce-decb-4e51-a8ac-3 and stopping operator
2022-03-22T14:33:00.9079784Z 2022-03-22 14:32:55,735 1 i.j.o.j.AbstractOperatorExtension [INFO ] Waiting for namespace eventsourceit-receivingperiodicevents-099d30ce-decb-4e51-a8ac-3 to be deleted
2022-03-22T14:33:00.9080507Z 2022-03-22 14:33:00,899 1 i.j.o.Operator                 [INFO ] Operator SDK 3.0.0-SNAPSHOT is shutting down...
2022-03-22T14:33:00.9081081Z 2022-03-22 14:33:00,899 1 i.j.o.a.c.ExecutorServiceManager [DEBUG] Closing executor
2022-03-22T14:33:00.9126512Z [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 5.291 s <<< FAILURE! - in io.javaoperatorsdk.operator.EventSourceIT
2022-03-22T14:33:00.9136008Z [ERROR] io.javaoperatorsdk.operator.EventSourceIT.receivingPeriodicEvents  Time elapsed: 5.222 s  <<< ERROR!
2022-03-22T14:33:00.9137505Z io.javaoperatorsdk.operator.OperatorException: Couldn't start source io.javaoperatorsdk.operator.processing.event.source.controller.ControllerResourceEventSource
2022-03-22T14:33:00.9139288Z Caused by: io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: GET at: https://192.168.49.2:8443/apis/sample.javaoperatorsdk/v1/namespaces/eventsourceit-receivingperiodicevents-099d30ce-decb-4e51-a8ac-3/eventsourcesamples. Message: Not Found.
2022-03-22T14:33:00.9142836Z 
2022-03-22T14:33:00.9146043Z [INFO] Running io.javaoperatorsdk.operator.SubResourceUpdateIT