Add data point for testnet startup and shutdown

ci/metrics_write_datapoint.sh

@@ -0,0 +1,16 @@
+#!/bin/bash -e
+
+point=$1
+if [[ -z $point ]]; then
+  echo "Data point not specified"
+  exit 1
+fi
+
+echo "Influx data point: $point"
+if [[ -z $INFLUX_DATABASE || -z $INFLUX_USERNAME || -z $INFLUX_PASSWORD ]]; then
+  echo Influx user credentials not found
+  exit 0
+fi
+
+echo "https://metrics.solana.com:8086/write?db=${INFLUX_DATABASE}&u=${INFLUX_USERNAME}&p=${INFLUX_PASSWORD}" \
+  | xargs curl -XPOST --data-binary "$point"