[scripts][before_test] Use gitlab runner id for build container

Use mv rather than ln to handle algorithm libraries.
4 jobs for algorithm_cxx_v2 in 13 minutes and 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #150683
docker
build_linux_36

00:04:33

58.0%
passed #150684
macosx
build_macosx_36

00:07:39

58.0%
 
  Docker
passed #150701
docker-build
docker_linux_36

00:06:06

failed #150685
docker-build
docker_linux_36

00:26:52

72.0%