ceph-dev-pipeline/build/Jenkinsfile: Skip debug containers

#2497 introduced a debug flavor.
This seems to cause conflicts with the image being pushed to quay as
one of the flavors might override the other.

One possible solution to this would be to name the debug images
differently. However, since the current behavior might cause unexpected
testing results. Skip building containers for debug builds at all.

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

Author: Matan-B

ceph-dev-pipeline/build/Jenkinsfile

@@ -357,7 +357,8 @@ pipeline {
               DOCKER_HUB_CREDS = credentials('dgalloway-docker-hub')
             }
             when {
-              expression { return build_matrix["${DIST}_${ARCH}"] == true }
+              // Do not build a conatiner for debug builds
+              expression { return build_matrix["${DIST}_${ARCH}"] == true && env.FLAVOR != 'debug' }
             }
             steps {
               script {