CI: Jenkins: Revert "CI: Jenkins: Drop CI env var - we don't use it"
CI: Jenkins: Revert "CI: Jenkins: Drop CI env var - we don't use it"

This reverts commit 13828f06e7e3b9af626e601faa2123c377015faa.
Apparently we do need it to enable proper coverage tool operation.

Fixes: #682

Signed-off-by: Graham Whaley <95f36e5ac6982f4574a5c449c37cf652e934d2b9@intel.com>

MarioCarrilloA/tests,clearcontainers/tests,chavafg/tests,chavafg/tests,MarioCarrilloA/tests,devimc/tests,devimc/tests,clearcontainers/tests