Add the scan speed option for service discovery

bamboo/run.sh

@@ -26,6 +26,10 @@ ports="$(bashio::config 'discover_ports')"
 if [ -n "${ports}" ]; then
   export BAMBOO_DISCOVER_PORTS="${ports}"
 fi
+rate="$(bashio::config 'discover_rate')"
+if [ -n "${rate}" ]; then
+  export BAMBOO_DISCOVER_RATE="${rate}"
+fi
 
 bashio::log.info "Starting $(bamboo -version), connecting to ${BAMBOO_HAMMERHEAD}"
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