Add invoke as task runner, ruff and fix mypy errors

files/backups/backup-all.py

@@ -4,6 +4,7 @@ Backup script for all applications
 Automatically discovers and runs backup scripts for all users,
 then creates restic backups and sends notifications.
 """
+
 import itertools
 import os
 import sys
@@ -153,7 +154,7 @@ class ResticStorage(Storage):
 
 
 class Notifier(ABC):
-    def send(self, html_message: str):
+    def send(self, html_message: str) -> None:
         raise NotImplementedError()
 
 
@@ -174,7 +175,7 @@ class TelegramNotifier(Notifier):
                 f"Missing notification configuration values for backend {name}"
             )
 
-    def send(self, html_message: str):
+    def send(self, html_message: str) -> None:
         url = f"https://api.telegram.org/bot{self.telegram_bot_token}/sendMessage"
         data = {
             "chat_id": self.telegram_chat_id,
@@ -358,10 +359,10 @@ class BackupManager:
                 )
 
             if self.warnings:
-                message += f"\n\n⚠️ Предупреждения:\n" + "\n".join(self.warnings)
+                message += "\n\n⚠️ Предупреждения:\n" + "\n".join(self.warnings)
 
             if self.errors:
-                message += f"\n\n❌ Ошибки:\n" + "\n".join(self.errors)
+                message += "\n\n❌ Ошибки:\n" + "\n".join(self.errors)
 
         for notificator in self.notifiers:
             try:
@@ -470,7 +471,7 @@ def initialize(config_path: Path) -> BackupManager:
     )
 
 
-def main():
+def main() -> None:
     try:
         backup_manager = initialize(CONFIG_PATH)
         success = backup_manager.run_backup_process()