Add misconfiguration of docker secret in code (See for docker compose: https://docs.docker.com/engine/swarm/secrets/)

[commjoen]

Create a challenge for docker compose setup, where the compose secret is hardcoded inside teh docker compose yml

TODO:

• [ ] Implement a docker-compose setup for wrongsecrets with the secret as an env var, add the compose file to the repo
• [ ] implement the challenge according to contributing.md, but make sure we read the challenge from the file so we can play the challenge without the need to actually use teh docker-compose setup.