ci: Use the newer dockerhub mirror variable
New dockerhub mirror variable doesn't include the `/` at the end so it
needs adding before using it.
Signed-off-by:
Drew Reed <Drew.Reed@arm.com>
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New dockerhub mirror variable doesn't include the `/` at the end so it
needs adding before using it.
Signed-off-by:
Drew Reed <Drew.Reed@arm.com>