introduce uptime monitor for easytier public nodes (#1250)

easytier-contrib/easytier-uptime/src/migrator/mod.rs

@@ -0,0 +1,12 @@
+use sea_orm_migration::prelude::*;
+
+mod m20250101_000001_create_tables;
+
+pub struct Migrator;
+
+#[async_trait::async_trait]
+impl MigratorTrait for Migrator {
+    fn migrations() -> Vec<Box<dyn MigrationTrait>> {
+        vec![Box::new(m20250101_000001_create_tables::Migration)]
+    }
+}