Settel over to docker-compose and remove db init code

[EugenMayer]

Using docker compose, you could remove you complete DB handling, reduce image size in general and also remove complexity.

I created https://github.com/EugenMayer/rundeck-boilerplate e.g. which is as simple as just running docker-compose up - and it works out of the box.

It better then docker run anyway, its better to handle, better to configuration and better to understand - and its still a oneliner. And with it, comes the extra db and its out of your hands.

Its a pitty that i will have to fork your project to remove the mysql binary and also add wait-for-it to ensure the async start has the right order and i really rather would wish you join me, and instead of forking, we migrate your project over there. You have done so much work already and this is very appreciated

[EugenMayer]

after reviewing i decided to hard fork, not planing to merge back in the terms that i really changed a lot of things not being backwarts compatible to the people already using your image. Closing this, if yo wish, reopen anytime