Add script to build static binary and put it in ./

build-static.bash

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -ex
+
+export RUSTFLAGS='-C target-feature=+crt-static'
+cargo build --release --target x86_64-unknown-linux-gnu
+cp target/x86_64-unknown-linux-gnu/release/keep-rust ./