Aliveness check endpoint

Implement a /ping endpoint (or similar) so that we can check when the system is ready to serve requests.

This should only return a 2XX code once all caches are up to date.

Can I implement this one :P

As part of this, we should also move GET /size back into the general router, so it requires auth

Can I implement this one :P

Yes :) But I suggest waiting until #106 is merged :P

Bikeshed: /healthcheck is a better name for the route :P

Maybe two endpoints? An aliveness check which returns as soon as it's serving, and then a readiness check, which is when the caches are ready.

This will line up with the checks we can configure in k8s

On second thought, and some discussion in #dev-pixels having one health check endpoint should be enough.

As long as it returns when the caches are ready, we can use that for a liveness and readiness check.

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