CI: support skip_testing option

6 jobs for !467 with ci_skip_testing in 37 minutes and 34 seconds (queued for 4 seconds)
latest detached
Status Job ID Name Coverage
  Prepare
passed #2338
superbuild-prepare

00:00:42

 
  Build
passed #2339
debian-build

00:24:51

passed #2341
superbuild-build

00:31:42

passed #2340
ubuntu-llvm

00:36:51

 
  External
passed cdash:debian-unstable-gcc

passed cdash:ubuntu-18.04-llvm