so that the probe doesn't continue running indefinitely
- resolves the issue with Kubernetes <1.20
"Before Kubernetes 1.20, the field timeoutSeconds was not respected for exec probes:
probes continued running indefinitely, even past their configured deadline,
until a result was returned."
in https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#configure-probes
- #179 already fixed the issue for Kubernetes 1.20+