genrelnotes moves the tree between commits and so a relative location
like HEAD isn't stable. Since I ran into the HEAD issue while preparing
for two consecutive releases, let's guard against it.
Change-Id: I70c6812cdfe0d0671b3d653744a062d9920a2394
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41339
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
81a30ec3a7