Prefer /usr/bin/env in shebang line

Not all systems have /bin/bash available (mine among them).

This change makes use of /usr/bin/env in place of /bin/bash.

Author: Corin Lawson

cmd/postgres_exporter/tests/test-smoke

@@ -1,5 +1,6 @@
-#!/bin/bash -x
+#!/usr/bin/env bash
 # Basic integration tests with postgres. Requires docker to work.
+set -x
 
 SOURCE="${BASH_SOURCE[0]}"
 while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink

gh-assets-clone.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Script to setup the assets clone of the repository using GIT_ASSETS_BRANCH and
 # GIT_API_KEY.
 

gh-metrics-push.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Script to copy and push new metric versions to the assets branch.
 
 [ ! -z "$GIT_ASSETS_BRANCH" ] || exit 1

postgres-metrics-get-changes.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Script to parse a text exposition format file into a unique list of metrics
 # output by the exporter and then build lists of added/removed metrics.
 

postgres_exporter_integration_test_script

@@ -1,6 +1,7 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # This script wraps the integration test binary so it produces concatenated
 # test output.
+set -x
 
 test_binary=$1
 shift