CI: Add docker tag variable.
Change SCP CI script to allow user to specify the docker tag if they would like to run with different docker image.
Signed-off-by: Mahmoud Elsabbagh mahmoud.elsabbagh@arm.com
Change SCP CI script to allow user to specify the docker tag if they would like to run with different docker image.
Signed-off-by: Mahmoud Elsabbagh mahmoud.elsabbagh@arm.com