Automated tests and builds

[JohnTheCoolingFan]

Automated tests and builds would make setup more easy and help testing new changes.

• [ ] Test scenarios
• [ ] Automated testing via launching the webserver
• [ ] Automated unit tests
• [x] Dockerfile
• [ ] Automated compilation and uploading of binaries
• [ ] Automated docker image publishing

[JohnTheCoolingFan]

sqlx allows making unit tests, but a mysql database must be set up.

axum also allows unit testing without setting up the whole webserver.

All of this allows making unit tests but they would not be as thorough as tests with a real webserver.