[BUG] Apprise only notify "Initializing"

[AFumi39]

Describe the bug
I set an APPRISE URL (to a Gotify instance), and it works, but... I noticed that the only notification I receive is "Photon-Docker Initializing".
Nothing about download complete, DB version updated, etc.

To Reproduce
Set the Environment variable "APPRISE_URLS" to something

Expected behavior
Notification fo every meaningful event

photon-docker configuration:

    ```
    - UPDATE_STRATEGY=PARALLEL
    - UPDATE_INTERVAL=168h # Check for updates every 7 days
    - REGION=europe
    - APPRISE_URLS=gotify://******

[rtuszik]

I will be adding more notifications in the upcoming release!