switch refresh to arena - will clean at process exit

src/main.zig

@@ -772,7 +772,7 @@ pub fn main(init: std.process.Init) !void {
         log.info("listening on port {d}", .{port});
         try server.listen();
     } else if (std.mem.eql(u8, command, "refresh")) {
-        try refresh(io, allocator, environ);
+        try refresh(io, init.arena.allocator(), environ);
     } else {
         printUsage();
     }