Panic while handling `/health?bundle=true`

[patrick-east]

Expected Behavior

No panic

Actual Behavior

Calling the health API can cause a panic:

Steps to Reproduce the Problem

Start opa server with a bundle as a data file, ex:

opa run -s ./my-bundle.tar.gz

Curl the health check

curl "http://localhost:8181/health?bundle=true

Additional Info

This can probably be fixed simply by switching the mutex to not be a pointer on the server.

Turns out the problem is that the logic for initializing the mutex was assuming a bundle plugin was active. Loading the bundle in from the CLI hides that.