set SETUPTOOLS_SCM_PRETEND_VERSION="0" variable because GitHub Actions
does not copy the .git directory into the container. Without that, the
build fails with the following error
LookupError: setuptools-scm was unable to detect version for /__w/dtc/dtc.
Signed-off-by: Biswapriyo Nath <nathbappai@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>