Thank you for your interest in Bitnami. I'm going to reply your questions one by one:
This section of our documentation explains how to retrieve the passwords in AWS LightSail
You can follow this guide to deploy a custom PHP application. It will be configured in the same way we configure our stacks.
Regarding the sub-domain, you can easily create a virtual host for your application
This section explains how to modify the default SSL certificates that Apache uses, in case you create a virtual host, you will also need to modify the certificates that are set in the httpd-vhosts.conf file of your application.
Let us know if you have any questions about this process.
Was my answer helpful? Click on