This file provides the flexibility to test any Zephyr commit in Linux
CI without any pollution of `git -C sof describe --dirty`. See (too)
long discussion in #6005 for details.
This new file will have no effect until #6005 is merged. However it can
and SHOULD be merged before #6005 because #6005 is backwards
incompatible and requires a "flag day" and the synchronization of
several moving parts. So merging this commit earlier means having one
less moving part to synchronize and it will simplify "flag day"
rehearsals.
Signed-off-by: Marc Herbert <marc.herbert@intel.com>