Add MailHog Docker Container

[kdcllc]

Add MailHog Docker Container for emails testing while in development.
https://github.com/ian-kent/MailHog
https://hub.docker.com/r/mailhog/mailhog/

Docker-compose entry

  mail:
    image: mailhog/mailhog
    ports:
      - "8025:8025"
      - "1025:1025"

[JudahGabriel]

FYI, you can already test emails in development. Whenever an email is about to be sent, we first store it in the database. For staging and production environments, it then takes that email and sends it. For development, it's not sent.

[kdcllc]

How about introducing Polly Library to manage all of the transient retries and any other retry logic. This kind of goes with the issue of Mail and also the Background service hosted inside of the asp.net core app.