ci: force single build mode for all configs

We currently build all test configs in release and debug mode, even when
only one set of binaries are needed. Where this is the case i.e. boot
tests) we should avoid building unused binaries. In some instances the
package step can take up to 4 minutes per build mode, this of-course
wasted compute time.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: Ic1082772f2983720cbd5a6e61902dee65c461f9f
1 file changed