feat: allow selecting tls or ssl for email notifications (#237)

migrations/000012.php

@@ -0,0 +1,12 @@
+<?php
+    // This migration adds a "encryption" column to the notifications table so that the encryption type can be stored.
+
+    /** @noinspection PhpUndefinedVariableInspection */
+    $columnQuery = $db->query("SELECT * FROM pragma_table_info('notifications') WHERE name='encryption'");
+    $columnRequired = $columnQuery->fetchArray(SQLITE3_ASSOC) === false;
+
+    if ($columnRequired) {
+        $db->exec('ALTER TABLE notifications ADD COLUMN `encryption` TEXT DEFAULT "tls"');
+        $db->exec('UPDATE notifications SET `encryption` = "tls"');
+    }
+?>