Add bash line to ci script

ci/before_deploy.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This script takes care of building your crate and packaging it for release
 
 set -ex

ci/install.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 set -ex
 
 main() {

ci/script.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This script takes care of testing your crate
 
 set -ex