[build] add binary size logging to Linux Release builds

platform/linux/scripts/after_success.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [ "${TRAVIS_PULL_REQUEST_BRANCH:-${TRAVIS_BRANCH}}" = "master" ] && [ "${BUILDTYPE}" = "Release" ]; then
+    CLOUDWATCH=true platform/linux/scripts/metrics.sh
+else
+    echo "Not logging binary size for branch or Debug build"
+fi

platform/linux/scripts/metrics.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+# Generate stripped version
+ARCH=$(uname -m)
+RENDER=build/linux-${ARCH}/Release/mbgl-render
+strip -s -x "${RENDER}" -o "${RENDER}-stripped"
+
+# Track individual architecture
+scripts/log_binary_size.sh "${RENDER}-stripped" "Platform=Linux,Compiler=${_CC},Arch=${ARCH}"