Fix directory permission bug on creating stateDir the first time

* fix: directory permission bug on creating stateDir the first time
* Change state dir permission on activation to at least 7xx which is required by microvm's systemd services

Author: 0xCCF4

nixos-modules/host/default.nix

@@ -27,7 +27,7 @@ in
     system.activationScripts.microvm-host = ''
       mkdir -p ${stateDir}
       chown ${user}:${group} ${stateDir}
-      chmod g+w ${stateDir}
+      chmod u+rwx,g+w ${stateDir}
     '';
 
     environment.systemPackages = [