I am not entirely sure why, but it seems like the Kubelet *always*
misses the first check in the readiness probe. This causes a full
60-second delay before the Authelia pod is marked as "ready," even
though it was actually ready within a second of the container starting.
To avoid this very long delay, during which Authelia is unreachable,
even though it is working fine, we can add a startup probe with a much
shorter check interval. The kubelet will not start readiness probes
until the startup probe returns successfully, so it won't miss the first
one any more.