Challenge51: Misconfiguration of docker secret in code

[Shubham-Patel07]

What kind of changes does this PR include?

• Fixes or refactors
• A new challenge
• Additional documentation
• Something else

Description

New challenge created for misconfiguration of docker secret in code.

Relations

Closes #811

Checklist:

• All the contributions made are solely the work of me and my co-authors
• I tested the changes in this PR (if applicable)
• I added unit tests to ensure my change works (when change in Java or on front-end code)
• I added UI tests to ensure my UI changes work (when change in the overall UI, not needed if just adding a challenge)
• The PR passes pre-commit hooks and automated tests

[Shubham-Patel07]

Hi @commjoen sir,
Is there anything else expected here in this pull request?

[commjoen]

No sir, we might need to relocate the example files, but otherwise we are good ;-)

[Shubham-Patel07]

Done !!

[commjoen]

I really like the challenge! I did some small fixes and textual changes, and now it looks awesome! @bendehaan what is your take on it?

Note: we only need to update the docker-compose reference in the text after merge to master ;-)