[🚀] Support multiple flags

[mal-tee]

:rocket: Feature request

Description

In a ctf setting it can be useful to have multiple flag strings for a task --> every team/instance can get its own unique flag.

Solution ideas

Overload the configuration option ctfKey.

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[bkimminich]

Most straightforward solution might be to accept a comma separated string or even JSON array as ctfKey and then splitting it and looping over them when creating flags per challenge.

[bkimminich]

every team/instance can get its own unique flag

Sidenote: Binding flags to users or teams wouldn't be possible, though, as we don't know what teams will exist on the Score Server, so unless you somehow solve this on the Score Server itself, teams could always submit any of the valid flags, no matter which ctfKey was used to create the flag.