When we enable OCB in the worker pool and a new image is build, once the builder pod has finished building the image it takes about 10-20 minutes to start applying this new image in the first node.

The issue was found while pre-merge verifying https://github.com/openshift/machine-config-operator/pull/4395

Always

1. Enable techpreview 
2. Create this MOSC

oc create -f - << EOF
apiVersion: machineconfiguration.openshift.io/v1alpha1
kind: MachineOSConfig
metadata:
  name: worker
spec:
  buildOutputs:
    currentImagePullSecret:
      name: $(oc get -n openshift-machine-config-operator sa default -ojsonpath='{.secrets[0].name}')
  machineConfigPool:
    name: worker
  buildInputs:
    imageBuilder:
      imageBuilderType: PodImageBuilder
    baseImagePullSecret:
      name: $(oc get secret -n openshift-config pull-secret -o json | jq "del(.metadata.namespace, .metadata.creationTimestamp, .metadata.resourceVersion, .metadata.uid, .metadata.name)" | jq '.metadata.name="pull-copy"' | oc -n openshift-machine-config-operator create -f - &> /dev/null; echo -n "pull-copy")
    renderedImagePushSecret:
      name: $(oc get -n openshift-machine-config-operator sa builder -ojsonpath='{.secrets[0].name}')
    renderedImagePushspec: "image-registry.openshift-image-registry.svc:5000/openshift-machine-config-operator/ocb-image:latest"
    containerFile:
    - containerfileArch: noarch
      content: |-
        # Pull the centos base image and enable the EPEL repository.
        FROM quay.io/centos/centos:stream9 AS centos
        RUN dnf install -y epel-release

        # Pull an image containing the yq utility.
        FROM docker.io/mikefarah/yq:latest AS yq

        # Build the final OS image for this MachineConfigPool.
        FROM configs AS final

        # Copy the EPEL configs into the final image.
        COPY --from=yq /usr/bin/yq /usr/bin/yq
        COPY --from=centos /etc/yum.repos.d /etc/yum.repos.d
        COPY --from=centos /etc/pki/rpm-gpg/RPM-GPG-KEY-* /etc/pki/rpm-gpg/

        # Install cowsay and ripgrep from the EPEL repository into the final image,
        # along with a custom cow file.
        RUN sed -i 's/\$stream/9-stream/g' /etc/yum.repos.d/centos*.repo && \
            rpm-ostree install cowsay ripgrep
EOF

The machine-os-builder pod will be created, then the build pod will be created too, the image will be built and then it will take about 10-20 minutes to start applying the new build in the first node.

After MCO finishes building the image it should not take 10/20 minutes to start applying the image in the first node.