Create airflow PostgreSQL database
Summary:
Airflow allows to manage workflow, expecially for data engineering.
Plan is to host it on Docker PaaS, but as we've a database cluster
for datasources set in D2760, we can use it for Airflow too.
Ref T1750
Test Plan: Deploy on db-A-001
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1750
Differential Revision: https://devcentral.nasqueron.org/D2941