tests: improve testing framework for impure vm tests

Also fix computet sops secret paths for vars

nixosModules/clanCore/vars/secret/sops/default.nix

@@ -10,9 +10,10 @@ let
 
   inherit (import ./funcs.nix { inherit lib; }) listVars;
 
-  varsDir = config.clan.core.clanDir + "/sops/vars";
+  varsDirMachines = config.clan.core.clanDir + "/sops/vars/per-machine";
+  varsDirShared = config.clan.core.clanDir + "/sops/vars/shared";
 
-  vars = listVars varsDir;
+  vars = (listVars varsDirMachines) ++ (listVars varsDirShared);
 
 in
 {
@@ -33,7 +34,7 @@ in
       flip map vars (secret: {
         name = secret.id;
         value = {
-          sopsFile = config.clan.core.clanDir + "/sops/vars/${secret.id}/secret";
+          sopsFile = secret.sopsFile;
           format = "binary";
         };
       })

nixosModules/clanCore/vars/secret/sops/funcs.nix

@@ -23,6 +23,7 @@ rec {
           generator = generator_name;
           name = secret_name;
           id = "${machine_name}/${generator_name}/${secret_name}";
+          sopsFile = "${varsDir}/${machine_name}/${generator_name}/${secret_name}/secret";
         })
       )
     );

nixosModules/clanCore/vm.nix

@@ -39,9 +39,6 @@ let
 
     boot.initrd.systemd.enable = true;
 
-    # currently needed for system.etc.overlay.enable
-    boot.kernelPackages = pkgs.linuxPackages_latest;
-
     boot.initrd.systemd.storePaths = [
       pkgs.util-linux
       pkgs.e2fsprogs