Add an action to reinstall Amavis antivirus

The Plesk Email Security extension configures Dovecot to always use Amavis for sending emails.
To ensure emails can still be sent after the conversion, we need to reinstall Amavis
More details can be found at plesk/centos2alma#288

pleskdistup/actions/extensions.py

@@ -283,3 +283,29 @@ def _do_check(self) -> bool:
         # Therefore, it's advisable to inform users about potential issues beforehand
         # If you add support for other OSes it worth to check the RAM requirements for amavis on them
         return not packages.is_package_installed("amavis") or self._get_available_ram() > self.required_ram or self.amavis_upgrade_allowed
+
+
+class ReinstallAmavisAntivirus(action.ActiveAction):
+    def __init__(self):
+        self.name = "reinstalling amavis antivirus"
+
+    def _is_required(self) -> bool:
+        return packages.is_package_installed("amavis")
+
+    def _prepare_action(self) -> action.ActionResult:
+        return action.ActionResult()
+
+    def _post_action(self) -> action.ActionResult:
+        packages.install_packages(["amavis"])
+
+        amavis_systemd_service = "amavisd.service"
+        if systemd.is_service_startable(amavis_systemd_service):
+            util.logged_check_call(["/usr/bin/systemctl", "enable", amavis_systemd_service])
+
+        return action.ActionResult()
+
+    def _revert_action(self) -> action.ActionResult:
+        return action.ActionResult()
+
+    def estimate_post_time(self) -> int:
+        return 30