Add Gotify Support and Startup Message

[bruj0]

This pull request introduces the following changes:

1. Gotify Notification Support

• Added a new [gotify] section in the config.toml file to configure Gotify notifications.
• Updated the notification logic to support both Telegram and Gotify services.
• Introduced new configuration fields:
  • url: The base URL of the Gotify server.
  • token: The application token for authentication.
  • title: (Optional) Title prefix for notifications.
  • priority: (Optional) Priority level for notifications.

2. Startup Message

• Added a log message at application startup to confirm the notifier is running and ready to monitor the journal file.

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Configuration Example

Here is an example config.toml file with Gotify configuration:

[notification]
service = "gotify"

[gotify]
url = "https://gotify.myserver.com"
token = "abc123xyz"
title = "ED Alerts"
priority = 8

Additional Notes

• The priority field in Gotify configuration is optional and defaults to 5 if not specified.
• The startup message helps users confirm the application is running without needing to wait for an event.