Add restore.sh script (#7284)

Author: captainsafia

restore.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+source="${BASH_SOURCE[0]}"
+
+function is_cygwin_or_mingw()
+{
+  case $(uname -s) in
+    CYGWIN*)    return 0;;
+    MINGW*)     return 0;;
+    *)          return 1;;
+  esac
+}
+
+# resolve $SOURCE until the file is no longer a symlink
+while [[ -h $source ]]; do
+  scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
+  source="$(readlink "$source")"
+
+  # if $source was a relative symlink, we need to resolve it relative to the path where the
+  # symlink file was located
+  [[ $source != /* ]] && source="$scriptroot/$source"
+done
+
+scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
+"$scriptroot/eng/build.sh" --restore $@