Feature/22-api-database

[Intrpt]

• [x] Decide database & write ADR: use (My)sql,
• [x] Decide ORM & write ADR: don't use any ORM.
• [x] Implemented migration script that applies sql scripts from the folder "migrations". https://github.com/AustrianDataLAB/IndieGameStream/tree/feature/22-api-database/api/migrations https://github.com/AustrianDataLAB/IndieGameStream/blob/60c5aaa860beff44ad6ce5960cdcbcb0c0744c60/api/scripts/databaseScripts.go#L37
• [x] change repository so that it saves/loads from the database https://github.com/AustrianDataLAB/IndieGameStream/blob/feature/22-api-database/api/repositories/gameRepository.go
• [x] Implement tests for game repository https://github.com/AustrianDataLAB/IndieGameStream/blob/feature/22-api-database/api/tests/gameRepository_test.go
• [x] Add database dockerfile for local deployment: Implemented docker-compose that uses bitnami/mysql docker image. https://github.com/AustrianDataLAB/IndieGameStream/blob/feature/22-api-database/api/docker-compose.yml
• [x] Implemented api multi stage dockerfile (build, test, release))

I also had to change the interface of GameRepository. However this change doesn't effect the REST API.

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