Deploy Nasqueron private Docker registry API container

Summary:
Microservice to serve the https://api.nasqueron.org/docker/registry/ part,
per https://docs.nasqueron.org/docker-registry-api/

Ref T1461

Test Plan:

• salt equatower state.apply roles/paas-docker/containers/docker-registry-api
• Browse http://equatower.nasqueron.org:20080/docker/registry/status
• Browse http://equatower.nasqueron.org:20080/docker/registry/stats
• curl http://equatower.nasqueron.org:20080/docker/registry/repository/getAll | jq

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1461

Differential Revision: https://devcentral.nasqueron.org/D1891