Add bash shebangs

builder/package.centos-6

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/centos-6 ]]; then
   mkdir -p /tmp/output/centos-6
 fi

builder/package.centos-7

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/centos-7 ]]; then
   mkdir -p /tmp/output/centos-7
 fi

builder/package.debian-9

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/debian-9 ]]; then
   mkdir -p /tmp/output/debian-9
 fi

builder/package.opensuse-15

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/opensuse-15 ]]; then
   mkdir -p /tmp/output/opensuse-15
 fi

builder/package.opensuse-42

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/opensuse-42 ]]; then
   mkdir -p /tmp/output/opensuse-42
 fi

builder/package.ubuntu-1604

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/ubuntu-1604 ]]; then
   mkdir -p /tmp/output/ubuntu-1604
 fi

builder/package.ubuntu-1804

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ ! -d /tmp/output/ubuntu-1804 ]]; then
   mkdir -p /tmp/output/ubuntu-1804
 fi