Dockerize Junction and related components

[palnabarun]

Services to be run

1. Postgres 12
2. Redis 6
3. Web application on Python 3
4. Celery workers on Python 3

Additional system-wide config

1. Nginx rule to reverse proxy traffic to the containers
2. Co-ordinate config management for production

Follow Up

• Remove Python 2.7 from CI
• Remove other sunsetted Python versions from support (if any)
• Upgrade to Django 2.2 LTS and fix all dependency issues (Django version bump #684)

[onlinejudge95]

I can take it if it helps ease the burden. I have experience doing dockerization in python

[palnabarun]

@onlinejudge95 -- Thanks for the help! You can get started with the port to Django 2.2 LTS.

There will some major breaking changes though. Please feel free to create a new umbrella issue for tracking the work.

[onlinejudge95]

Will raise a PR by weekend

[onlinejudge95]

@palnabarun meanwhile can you provide clarity on Remove other sunsetted Python versions from support (if any). This can go independent(to some extent, corner cases being the dependencies in this project having a hard limit) just like 2.7 one.

As far as upgrade goes I will be removing the Draft PR and starting from scratch. WIll ping about the same in the issue #684

[palnabarun]

meanwhile can you provide clarity on Remove other sunsetted Python versions from support (if any).

By that I mean 3.5 is going to be EOL on 2020-09-13, IIRC. We should target 3.6+ for CI and production.

As far as upgrade goes I will be removing the Draft PR and starting from scratch. WIll ping about the same in the issue #684

Sure.

[pradyunsg]

TBH, given that there's only 1 deployment that we know of, it might be a good idea to to push for 3.8+ compatibility.