Set PLATFORMS to "all" for multi-platform image support in release pr…

[ashokpariya0]

…ocess

Added export of PLATFORMS=all to automation/release.sh to ensure the build supports multiple platforms.

What this PR does / why we need it:
The CNAO post-submit Prow job, defined [here](https://github.com/kubevirt/project-infra/blob/d274a82bc8f88e6c5c4c35de60de9b357b34268d/github/ci/prow-deploy/files/jobs/kubevirt/cluster-network-addons-operator/cluster-network-addons-operator-postsubmits.yaml#L25), uses ./automation/release.sh to build and post CNAO release images. By default, it posts an image for the amd64 architecture (based on the host system). To enable building of multi-platform images, the PLATFORMS=all variable is added, allowing the creation of images for additional architectures like arm64, s390x, and others.

Special notes for your reviewer:
Build instruction is available at: https://gist.github.com/ashokpariya0/19b6f235a3fe149d16d82d92c84ce542/edit

Release note:

None

[kubevirt-bot]

Hi @ashokpariya0. Thanks for your PR.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[RamLavi]

/ok-to-test

[oshoval]

Thanks
/test all

ok-to-test is gone i think

[oshoval]

/hold
until @maiqueb gives green light so we wont merge by mistake stuff
(first need to finish passt removal effort iiuc)

[oshoval]

Thanks
Nits:
Please use new lines on PR desc
Please fix the wrapping of the title, so it wont reach the PR desc

/lgtm
/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oshoval

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[oshoval]

@maiqueb
we can unhold this one imo, because it will only affect when a new release is created by creating multi arch,
nothing more should happen
wdyt?

EDIT - since Ashok is going to vacation, lets wait, because if any problems arise we would need assist

[oshoval]

Note, there is a new branch now, so iiuc we can unhold
as the danger is gone

[oshoval]

/hold cancel
Thanks

[oshoval]

About a release for CNAO main, lets do it only after we finish with all components wrt to multi arch