Add other notification providers

[albertorizzi]

Describe the feature you would like to see

I think using this https://github.com/nicholas-fedor/shoutrrr, it's easy to implement several providers. For example https://beszel.dev/guide/notifications/#services-overview

Describe how you would like to see this feature implemented

No response

Describe any alternatives you've considered

No response

[amir20]

I don't understand this. Dozzle supports webhooks, allowing you to use any service. If I support specific providers, I will likely receive many questions about setting them up, which would be too much work.

Dozzle Cloud is designed to be more opinionated, so that could be an option. For now, I am keeping Dozzle limited to webhooks.

[amir20]

#4448