[build] add binary size logging to Linux Release builds

scripts/log_binary_size.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+function filesize {
+    if [ `uname -s` = 'Darwin' ]; then
+        stat -f%z $1
+    else
+        stat --printf=%s $1
+    fi
+}
+
+# Uploads build metrics to CloudWatch
+FILE=$1
+DIMENSIONS=$2
+
+if [ -z "${DIMENSIONS}" ]; then
+    echo "* No dimensions specified for '${FILE}'"
+    exit 1
+fi
+
+if [ -f "${FILE}" ]; then
+    SIZE=`filesize ${FILE}`
+    echo "* Reporting `LC_NUMERIC=en_US printf "%'10.f\n" ${SIZE}` bytes for '${DIMENSIONS}' (${FILE})"
+    if [ ${CLOUDWATCH} ]; then
+        aws --region us-east-1 cloudwatch put-metric-data \
+            --namespace "Mapbox/GL" \
+            --metric-name "BinarySize" \
+            --unit "Bytes" \
+            --value ${SIZE} \
+            --dimensions "${DIMENSIONS}"
+    fi
+else
+    echo "* File '${FILE}' does not exist"
+    exit 1
+fi