Build and publish image with Jenkins

Add a Jenkins pipeline to build and publish docker images
on the DockerHub.

The images are built on every branches but only pusblished on staging
and stable branches (i.e. develop and master by default).

Images are published with multiples tags:

- <image_name>:<short_commit_ref>
- <image_name>:<stable|staging>-latest
1 job for feature/jenkins-ci in 0 seconds
Status Job ID Name Coverage
  External
passed Build image

00:02:05