Add Dockerfile and container startup helper script

3 jobs for master in 1 second (queued for 2 seconds)
Name Stage Failure
build Build
Cloning into '/home/gitlab-runner/builds/48656cfd/0/herzi/project/bob3/bobdude'...
Checking out fd9716a6 as master...
Skipping Git submodules setup
$ # Auto DevOps variables and functions # collapsed multi-line command
$ setup_docker
$ build
Logging to GitLab Container Registry with CI credentials...
main: line 84: docker: command not found
ERROR: Job failed: exit status 1