Update container image in PodSpec to use ubuntu

[ashokpariya0]

Changed the container image from "centos" to "ubuntu" in the PodSpec function to specify a more specific version of the CentOS image.

What this PR does / why we need it:

We are encountering an unusual issue with accessing the CentOS image. More details at: kubevirt/cluster-network-addons-operator#2179

Since this test is not dependent on any specific image, we would like to switch from CentOS to Ubuntu in order to get the bridge marker test lane to pass.

For now, we will proceed with the Ubuntu image, which is 73.8 MB in size.

Meanwhile, we can investigate the issue with accessing the CentOS image in parallel.

Special notes for your reviewer:

Release note:

None

[kubevirt-bot]

Hi @ashokpariya0. Thanks for your PR.

I'm waiting for a kubevirt member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[oshoval]

Thanks !

[oshoval]

/retest
EDIT - ah oops it was already running

[oshoval]

@phoracek can you review please?

[RamLavi]

/ok-to-test
/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RamLavi

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[RamLavi]

checking solution manually via CNAO kubevirt/cluster-network-addons-operator#2186

[ashokpariya0]

it seems bridge marker test lane passed finally now :)

https://prow.ci.kubevirt.io/log?container=test&id=1905234905827119104&job=pull-e2e-cluster-network-addons-operator-br-marker-functests

JUnit report was created: /logs/artifacts/junit.functest.xml

Ran 2 of 2 Specs in 220.073 seconds
SUCCESS! -- 2 Passed | 0 Failed | 0 Pending | 0 Skipped

[oshoval]

awesome, can you please create a bm release ?