System authentication

[flocke]

Similar to issue #20 I would love to have the option to use my Linux system users to login to gotify. As a bonus maybe only those that belong to a certain group.

[jmattheis]

Seems like a nice idea!

[jmattheis]

This would be a cool feature but I think it is not really needed and as there isn't much need for it, I'll close this issue for now.

[minecraftchest1]

I would also like to see this.