fix JWK checking

[t8]

No description provided.

[t8]

@johnletey & @fabianriewe - Would love a review here 😅

This fixes environment variable issues for any new AuthNodes coming online.

[johnletey]

@t8 Sorry for the late reply here 😅 If I'm understanding this correctly, you want to put the contents of your keyfile into the config?

I figured that users would want to instead put a path to their keyfile instead 🤷🏻‍♂️

[t8]

Ahh sorry @johnletey, I may have misunderstood. You seem to be checking the location statically here:

Because of this, the subsequent readFileSync throws errors whenever someone configures using environment variables. That is what this fix was for. If you want to check a path and support environment variables, I can push an update to this PR.

EDIT:
I now see you're checking config.json statically and not the keyfile. My bad!

[johnletey]

Ah yeah we are only statically checking the configuration file. However, we pull the keyfile path from the config 😄

[t8]

🌴 to forehead. Will push a fix shortly!