Add sanity check to linux build script

Author: bfirsh

script/build-linux

@@ -1,5 +1,7 @@
 #!/bin/sh
+set -ex
 mkdir -p `pwd`/dist
 chmod 777 `pwd`/dist
 docker build -t fig .
 docker run -v `pwd`/dist:/code/dist fig pyinstaller -F bin/fig
+docker run -v `pwd`/dist:/code/dist fig dist/fig --version