disable autoUpdate in microvms

hosts/containers/grafana/default.nix

@@ -9,7 +9,6 @@ in {
     mounts = [ "etc" "home" "var"];
   };
   c3d2.isInHq = false;
-  c3d2.autoUpdate = true;
 
   services.openssh.enable = true;
   # noXlibs breaks cairo:

hosts/containers/matemat/default.nix

@@ -2,7 +2,6 @@
 
 {
   c3d2 = {
-    autoUpdate = true;
     deployment = {
       server = "server10";
       mounts = [ "etc" "home" "var"];

hosts/containers/mucbot/default.nix

@@ -6,7 +6,6 @@
     mounts = [ "etc" "var"];
   };
 
-  c3d2.autoUpdate = true;
   networking.hostName = "mucbot";
 
   users.users.tigger = {

hosts/containers/scrape/default.nix

@@ -12,7 +12,6 @@ let
 in {
   c3d2 = {
     isInHq = false;
-    autoUpdate = true;
     deployment = {
       server = "server10";
       mounts = [ "etc" "home" "var"];

hosts/containers/spaceapi/default.nix

@@ -8,8 +8,6 @@
   networking.hostName = "spaceapi";
   networking.firewall.enable = false;
 
-  c3d2.autoUpdate = true;
-
   services.spaceapi = { enable = true; };
 
   # HACK for ‘ekg-json-0.1.0.6’ nixos-22.05

modules/microvm.nix

@@ -143,5 +143,8 @@ in
           };
       }) {} nets;
     };
+
+    # autoupdates do not make sense inside MicroVMs with read-only /nix/store
+    c3d2.autoUpdate = false;
   };
 }