Integrate Docker (maximum requirements)

[php-coder]

• use ansible to deploy docker containers into the VM
• backups
• check for vulnerabilities/updates
• consider using docker-maven-plugin for building Docker images (Use docker-maven-plugin for building Docker images #83)
• consider using https://github.com/docker/docker-bench-security
• configure GC of unused metadata/images (https://docs.docker.com/registry/garbage-collection/)
• dockerhub: update description
• dockerhub: configure auto-build (see https://habrahabr.ru/post/310530/)
• run with --cap-drop all (see http://www.projectatomic.io/blog/2016/01/how-to-run-a-more-secure-non-root-user-container/)
• run with --security-opt=no-new-privileges (see http://www.projectatomic.io/blog/2016/03/no-new-privs-docker/)
• add badge (https://microbadger.com/images/phpcoder/mystamps)
• consider using scanner (https://github.com/arminc/clair-scanner)
• https://github.com/replicatedhq/dockerfilelint

Follow-up to #534