*: don't hardcode path to bash

Bash isn't always at this location. These scripts in particular are
being updated because they are called from outside of the SDK.

core_roller_upload

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2013 The CoreOS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

core_sign_update

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2014 CoreOS, Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

oem/azure/publish.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This script will copy the Azure image from the CoreOS build bucket into
 # Azure storage, create an Azure VM image, and replicate it to all regions. It

oem/azure/replicate-image.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This script will replicate the given image into all Azure regions. It needs
 # to be run in an environment where the azure-xplat-cli has been installed and

oem/azure/set-image-metadata.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This script will set the icon, recommended VM size, and optionally the
 # publication date for the specified OS image to the CoreOS logo. It needs to

oem/azure/share-image.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This script will replicate the given image into all Azure regions. It needs
 # to be run in an environment where the azure-xplat-cli has been installed and

oem/azure/unreplicate-image.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This script will un-replicate the given image. It needs to be run in an
 # environment where the azure-xplat-cli has been installed and configured with

oem/azure/update-gallery.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This script will update the Azure Gallery repo with the specified group and
 # version.

offline_signing/download.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 BOARD="$1"

offline_signing/new_key.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 KEY="$1"

offline_signing/print_key.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # If there is no default printer use ./print_key.sh prod-2 -d printer_name
 # List available printers with lpstat -a
 

offline_signing/sign.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 DATA_DIR="$(readlink -f "$1")"