Create a separate repo where you allow actions to run, so you can get the secret out

[commjoen]

Create a separate repo where you allow actions to run, so you can get the secret out. The idea would be that you have a challenge with a forkable action+Secret, so anyone forking this repository should get access to the given secret.
TODO:

• Have the Github secret forkable
• Create a github action using it
• Create the actual challenge with the secret encrypted as part of the java code (See contributing.md on how to create the challenge)

[commjoen]

Depends on #453 in order to make all items relatable and easy to find :) .

[commjoen]

Given a secret can no longer be used in forks unless you use pull_request_target which will result in a lot of spam PRs, maybe we can instead just have an encrypted secret in a github action with the key embedded into it?

[commjoen]

Removing additional labels until we are sure what to do with it :D (@bendehaan )