portability enhancement: use "#!/usr/bin/env <interpreter>" on all perl scripts and shell scripts that use bash extensions, and use "#!/bin/sh" on the rest.

Docker/buildAndPush.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Assume we're in wolfssl/Docker
 WOLFSSL_DIR=$(builtin cd ${BASH_SOURCE%/*}/..; pwd)

Docker/run.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 echo "Running with \"${*}\"..."
 

Docker/yocto/buildAndPush.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Assume we're in wolfssl/Docker/yocto
 WOLFSSL_DIR=$(builtin cd ${BASH_SOURCE%/*}/../..; pwd)