GitLab

* add an option to build CK with legacy dockers

* change the custom docker settings

* add environment varianble for custom docker

* use a new variable for legacy docker name

* new way to pass docker names for legacy OS

* add legacy docker check in the Build_CK function

* change groovy syntax

* add a check for legacy docker in getDockerImage

* make sure the legacy docker name is not empty

* remove the dumb-init call

* disable the tests in legacy OS dockers

* disable tests in legacy dockers

* use a different way to disable tests in legacy dockers

* rearrange the CI stages for legacy OS

* use different way to disable tests in legacy dockers

* update LD_LIBRARY_PATH for legacy dockers and add cron job

* update LD_LIBRARY_PATH at docker launch

* change the sytax for setting LD_LIBRARY_PATH