directory confusion missing readinessProbe config

[powellquiring]

directory confusion missing readinessProbe config
readinessProbe requires timeoutSeconds and failureThreshold are required

Fixes #1731

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[powellquiring]

@googlebot I signed it!

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[RichieEscarez]

Thanks @powellquiring !

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: powellquiring, RichieEscarez

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