[Optional] Dockerize Application, Setup MySQL

[michac789]

Setup Docker container:

• One image for the server
• One image for the database (use PostgreSQL or MySQL) *Currently, sqlite3 has some limitations (speed-wise, and functionality-wise), other advanced features might require a more sophisticated database than just SQLite
• Testing (CI) using docker (???)

These container will ensure a more similar environment and predictable results on different places.

[michac789]

edit: change to mysql instead, to keep consistent with current ntusu db

[michac789]

Based on research, PostgreSQL actually win against MySQL for almost all functionality... so can reconsider by how large of a margin it is

MySQL: make the setup same with ntusu db (not much work), but a bit less optimal PostgreSQL: can be potentially faster (and from django docs there're some features that are available on postgres but not on MySQL), but need to create the db instance first in aws, and need to migrate existing data, and need to update main su repo db to this