Jenkins for c4science with Docker and Pipeline

Summary: Deploy Jenkins master/slave using Docker images. At the moment, only the mater in dockerized because the slave must have access to the Docker socket and though the jobs have access to the slave instance, which is bad :)

Test Plan:
./run.sh
go to http://localhost:8080

then stop and remove the jenkins-master

re-run the master, data must be preserved

Tags: c4science, #continuous_integration

Maniphest Tasks: T1245, T1687

Differential Revision: https://c4science.ch/D111