Challenge 54 & Challenge55 hidden secrets in gitignore and .ssh

[Pastekitoo]

What kind of changes does this PR include?

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

Description

Challenge 54 is about a hidden secret in gitignore and Challenge 55 is about a hidden secret in .ssh.
Both secrets are encrypted and in base64 format to hide them from detection engines.
You can decrypt them with openssl and the passphrase given in the Description of the challenge.
The passphrase has to be available to all users in main page of the challenges.

Relations

Closes #613

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

[commjoen]

Love the challenges, can you fix the feedback, the pipeline and maybe add the plain pubkey and privatekwy in the same ssh config conmit by mistake challenge please?