add gen-output.sh

diff --git a/gen-output.sh b/gen-output.sh
new file mode 100755 (executable)
index 0000000..2dc1f97
--- /dev/null
+++ b/gen-output.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+exec cargo run > "output-for-`git describe`.json"