Update all helper scripts to '/usr/bin/env bash' shebang

helper-scripts/nextcloud.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 for bin in curl dirmngr; do
   if [[ -z $(which ${bin}) ]]; then echo "Cannot find ${bin}, exiting..."; exit 1; fi