Master periodic jobs are failing with "msg": "Error running container image prepare: failed"

Description:-

All the master periodic jobs are failing while modifying container images.

https://logserver.rdoproject.org/openstack-periodic-integration-main/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-standalone-master/21a7770/logs/undercloud/home/zuul/standalone_deploy.log.txt.gz

~~~
PLAY [External deployment step 1] **********************************************
2020-10-30 01:34:16.122192 | fa163ec6-0101-53e4-0bab-000000000102 | TASK | External deployment step 1
2020-10-30 01:34:16.137534 | fa163ec6-0101-53e4-0bab-000000000102 | OK | External deployment step 1 | undercloud | result={
    "changed": false,
    "msg": "Use --start-at-task 'External deployment step 1' to resume from this task"
}
2020-10-30 01:34:16.138464 | fa163ec6-0101-53e4-0bab-000000000102 | TIMING | External deployment step 1 | undercloud | 0:02:28.486354 | 0.02s
2020-10-30 01:34:16.181787 | fa163ec6-0101-53e4-0bab-000000000103 | TIMING | include_tasks | undercloud | 0:02:28.529674 | 0.01s
2020-10-30 01:34:16.214260 | 7cebd66f-bccd-4dc6-9d00-bb688c6ac72d | INCLUDED | /home/zuul/standalone-ansible-5yincrkd/external_deploy_steps_tasks_step1.yaml | undercloud
2020-10-30 01:34:16.244842 | fa163ec6-0101-53e4-0bab-000000000d01 | TASK | Container image prepare
2020-10-30 01:37:32.387611 | fa163ec6-0101-53e4-0bab-000000000d01 | FATAL | Container image prepare | undercloud | error={"changed": false, "error": "Modifying image 192.168.24.1:8787/tripleomaster/openstack-horizon:938acab2d960d1e9b3ede6e4d35983a8 failed", "msg": "Error running container image prepare: Modifying image 192.168.24.1:8787/tripleomaster/openstack-horizon:938acab2d960d1e9b3ede6e4d35983a8 failed", "params": {}, "success": false}
2020-10-30 01:37:32.390844 | fa163ec6-0101-53e4-0bab-000000000d01 | TIMING | tripleo_container_image_prepare : Container image prepare | undercloud | 0:05:44.738731 | 196.14s
~~~

https://logserver.rdoproject.org/openstack-periodic-integration-main/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-standalone-master/21a7770/logs/undercloud/var/log/tripleo-container-image-prepare.log.txt.gz
~~~
00000000003d | FATAL | Run yum_update.sh | localhost | error={"changed": true, "cmd": ["buildah", "run", "--volume", "/tmp/ansible.khxgug4e:/tmp/yum_update.sh", "--volume", "/etc/yum.repos.d:/etc/yum.repos.d", "--volume", "/etc/pki:/etc/pki", "--user", "root", "--net", "host", "openstack-horizon-working-container", "/tmp/yum_update.sh", "delorean-current"], "delta": "0:00:01.126458", "end": "2020-10-30 01:35:36.926783", "msg": "non-zero return code", "rc": 1, "start": "2020-10-30 01:35:35.800325", "stderr": "standard_init_linux.go:211: exec user process caused \"exec format error\"", "stderr_lines": ["standard_init_linux.go:211: exec user process caused \"exec format error\""], "stdout": "", "stdout_lines": []}
2020-10-30 01:35:36.956845 | fa163ec6-0101-5745-670c-00000000003d | TIMING | tripleo-modify-image : Run yum_update.sh | localhost | 0:00:03.961988 | 1.31s
2020-10-30 01:35:36.960747 | fa163ec6-0101-5745-670c-00000000003e | TASK | Run yum_update.sh (retry without yum cache)
2020-10-30 01:35:37.845219 | fa163ec6-0101-5745-670c-00000000003e | RETRY | Run yum_update.sh (retry without yum cache) | localhost | 2 retries

~~~

Another job example:-

~~~
https://logserver.rdoproject.org/openstack-periodic-integration-main/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-scenario002-standalone-master/c425eec/logs/undercloud/home/zuul/standalone_deploy.log.txt.gz
~~~