Fix runner image missing tag

Arran Walkerrequested to merge
ajwalker/fix-runner-image-platforms into main

What does this MR do?

The ubuntu image is also aliased with just the specified tag without ubuntu.

Why was this MR needed?

Missing tag that is being relied upon.

What's the best way to test this MR?

What are the relevant issue numbers?

Edited by Arran Walker

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