Software update notification (#1002) (#1054)

* add `auto_check_updates` config value

* add `auto_check_updates` to dist config

* add `Update` `NotificationType`

* implement update checker and worker

* add endpoint, add to documentation, add worker

* clone update_status_lock Arc

* fmt

* add more tests

* remove todo

* add to docs

* frontend update notice

* improve name in documentation

* add user-agent to update check request

* add update check request timeout

* openapi trait bound

* do not enable `auto_check_updates` by default

* remove redundant documentation

* surface fetch of update status error

* fail on version with pre-release for now, add additional test cases

* Update configuration.md

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Co-authored-by: Markus Unterwaditzer <markus-tarpit+git@unterwaditzer.net>

daemon/src/notifications.rs

@@ -26,6 +26,7 @@ pub enum NotificationError {
 pub enum NotificationType {
     Warning,
     LowBattery,
+    Update,
 }
 
 pub struct Notification {