Build ULC and EL_9 for aarch64

[arogge]

This PR enables building the ULC on aarch64.

To be able to test the ULC, we need a full set of packages for aarch64, too. To satisfy that requirement EL_9 will also be built for aarch64.

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• Short description and the purpose of this PR is present above this paragraph
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If you have any questions or problems, please give a comment in the PR.

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[sduehr]

Thanks, looks good.