[durruti] make durruti microvm

Networking still needs to be done but the vm boots using ```nix run .\#nixosConfigurations.durruti.config.microvm.declaredRunner```

machines/durruti/configuration.nix

@@ -5,7 +5,6 @@ with lib;
 {
   sops.defaultSopsFile = ./secrets.yaml;
 
-  boot.isContainer = true;
   networking = {
     hostName = mkDefault "durruti";
     useDHCP = false;