impl autoexec support for a single script file

src/main.zig

@@ -84,7 +84,12 @@ pub fn main() !void {
         .config = config,
     });
     defer context.destroy();
-
+    if (context.config.autoexec_path) |path| {
+        std.log.debug("Path: {s}", .{path});
+        const argv = [_][]const u8{"/bin/sh", "-c", path };
+        var child = std.process.Child.init(&argv, utils.gpa);
+        try child.spawn();
+    }
     try run(wl_display, context);
 }