[Feature] Convert Docker Env Variables to Toggles & Fields in Admin UI

[CloudGoesPwn]

Hello Team,

Thanks again for the great work and happy to see that your project is gaining some traction!

Giving the latest feature requests and the subsequent number of env. variables that were added I think it would be useful to move some or all of them under the Admin interface.

In my personal opinion only:

SECRET_KEY
SECRET_KEY_{GalleryId}
ADMIN_PASSWORD

Should eventually remain as variables.

[Cirx08]

This would require a lot of rework for little gain. I won't rule it out for the future but for now I'm putting this one on hold.