Figure out better password handling for build automation scripts

[lschaefer-sugarcrm]

From @mmarum-sugarcrm in #44:

There are some general security concerns with passing passwords over command line. (ex. they get exposed in process table when a user calls ps and exposed in shell history) This is probably less a concern when you are running these commands in short lived Docker containers but there could be logging going on that would be storing the password. We should open a ticket for supporting alternative methods in future. https://www.netmeister.org/blog/passing-passwords.html

Related to #51