bugfix: use env shebbang and requirenments failed to install on external modules.

scripts/install_external_modules.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 
 if [ -z "${EXTRA_MODULES_REPO}" ]; then
     exit
@@ -7,6 +8,6 @@ echo "Installing External Modules"
 
 git clone -q "${EXTRA_MODULES_REPO}" "app/modules"
 
-pip -q install --no-cache-dir -r req*.txt
+pip -q install --no-cache-dir -r app/modules/req*.txt