Don't hard-code path to bash. (#8)

hooks/command

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 source $(dirname ${BASH_SOURCE})/common
 
 # Use default julia test running harness

hooks/common

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -euo pipefail
 
 coverage=${BUILDKITE_PLUGIN_JULIA_TEST_COVERAGE:-true}

hooks/post-command

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 source $(dirname ${BASH_SOURCE})/common
 
 # If we either always upload a trace (or only upload on error), pack it and append it to our artifact paths

hooks/pre-command

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 source $(dirname ${BASH_SOURCE})/common
 
 echo "--- :julia: Instantiating project"