Add WEB_TIMEOUT_IN_SECONDS env var to set timeout
Add WEB_TIMEOUT_IN_SECONDS env var to set timeout

Manually set the threshold at which Rack::Timeout raises a timeout
exception if WEB_TIMEOUT_IN_SECONDS is set.

NB: Timing out is inherently unsafe for multi-threaded code:
https://github.com/heroku/rack-timeout#timing-out-inherently-unsafe

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