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