MDBF-558: Reorganize docker-compose and dockerfiles for feedback plugin

[an3l]

• Dockerfiles changes:

  • mariadb - do not use pip installation and related .py script, since new layers will be added in final image - delete .py script - create new bash script to initialize database, create new user and give proper grants - generate smaller image

  • app

    • do not install mariadb to increase generated image size
    • instead create networks in docker-compose file that will ensure proper inter container communication and set proper settings in app.settings.py - do not install gunicorn as dependency, but rather define it as an requirements to be installed with pip - do not create logs folder, but rather mount that folder during container creation.

  • nginx - remove Dockerfile and use vanilla nginx and mount needed configuration in docker-compose

• docker-compose changes:

  • environment variables, use proper env vars for db service, add container names
  • add networks tag in docker-compose for proper inter container communication
  • mount volume for gunicorn in logs directory
  • use mariadb.conf.d configuration file container path instead conf
  • bump the docker compose version to minimum version for networks
  • add healty check for mariadb container
  • use long syntax for conditions on web service to wait on mariadb service to be healthy
  • remove db dependency for nginx

• Test showing created user:

$ docker exec -it prod-mariadb mariadb -uroot -p1234 -e "select user,host from mysql.user"
+-------------+-----------+
| User        | Host      |
+-------------+-----------+
| feedback    | %         |
| root        | %         |
| feedback    | localhost |
| mariadb.sys | localhost |
| mysql       | localhost |
| root        | localhost |
+-------------+-----------+

• Test showing grants for created user:

$ docker exec -it prod-mariadb mariadb -uroot -p1234 -e "show grants for feedback@localhost"
+-----------------------------------------------------------------------------------------------------------------+
| Grants for feedback@localhost                                                                                   |
+-----------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO `feedback`@`localhost` IDENTIFIED BY PASSWORD '*06794F85E875D3ADBFE47B4FA68F8186667F44A9' |
| GRANT ALL PRIVILEGES ON `feedback_plugin`.* TO `feedback`@`localhost`                                           |
| GRANT ALL PRIVILEGES ON `test_feedback_plugin`.* TO `feedback`@`localhost`                                      |
+-----------------------------------------------------------------------------------------------------------------+

• Update Readme.md

[an3l]

@cvicentiu , @fauust please review