CI: Fix VERSION_REV and VERSION_BRANCH
Fix the output of the version revision and version branch, so that they're no
longer empty after the listed change below.
Cc: Dmitrii Galantsev <dmitrii.galantsev@amd.com>
Cc: Tom StDenis <tom.stdenis@amd.com>
Fixes: 7facf591681772 ("CI: Release RPM and DEB packages")
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>