DEVOPS: Build Docker image for the django & celery apps

[devnano]

Hey @emi420 ,

The Dockerfile for the api & celery apps is ready. Also, the CI workflow – github actions – to build the image and push it to DockerHub is set up and running properly as well :)

We'll need some help from your side in order to get the final config in place. So, could you please:

1. Login on DockerHub with your credentials
2. Create an hmap Organization
3. Create a backend repository within hmap organization created above
4. Issue a new DockerHub Access Key
5. Create repo secrets:
   • DOCKERHUB_USERNAME (set your DockerHub username e.g. emi420)
   • DOCKERHUB_TOKEN (set the token string issued on 4. above)

Let me know when this is ready and I'll update the workflow yaml.

Thanks!

PS: Related README sections are WIP.

cc @pedrodef