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So we don't need to provision aarch64 servers, which are these days
rarer than x8_64.

In the switch to the new runner tags, switch to one which contains the
device type, so we can dimension the runner jobs taking into account the
number of DUTs available.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <!11108>