allow configuring whether a node uses QEMU

lost in #412. Alternatively, we could have a comment on both lines
saying eg. “for NixOps4”

.forgejo/workflows/ci.yaml

@@ -25,13 +25,13 @@ jobs:
     runs-on: native
     steps:
       - uses: actions/checkout@v4
-      - run: cd services && nix-build -A tests.peertube
+      - run: nix-build services -A tests.peertube
 
   check-panel:
     runs-on: native
     steps:
       - uses: actions/checkout@v4
-      - run: cd panel && nix-build -A tests
+      - run: nix-build panel -A tests
 
   check-deployment-basic:
     runs-on: native

deployment/check/panel/nixosTest.nix

@@ -155,7 +155,6 @@ in
           SECRET_KEY = dummyFile;
         };
         port = panelPort;
-        nixops4Package = inputs.nixops4.packages.${pkgs.system}.default;
 
         deployment = {
           flake = "/run/fedipanel/flake";

flake.nix

@@ -43,7 +43,7 @@
           ];
 
           imports = [
-            (import "${git-hooks}/flake-module.nix")
+            "${git-hooks}/flake-module.nix"
             inputs.nixops4.modules.flake.default
 
             ./deployment/flake-part.nix

infra/common/resource.nix

@@ -36,8 +36,8 @@ in
   ## should go into the `./nixos` subdirectory.
   nixos.module = {
     imports = [
-      (import "${agenix}/modules/age.nix")
+      "${agenix}/modules/age.nix"
-      (import "${disko}/module.nix")
+      "${disko}/module.nix"
       ./options.nix
       ./nixos
     ];

panel/default.nix

@@ -22,7 +22,7 @@ in
       manage
 
       # NixOps4 and its dependencies
-      # FIXME: grab NixOps4 and add it here
+      pkgs.nixops4
       pkgs.nix
       pkgs.openssh
     ];

panel/nix/configuration.nix

@@ -147,6 +147,7 @@ in
         NixOps4 from the package's npins-based code, we will have to do with
         this workaround.
       '';
+      default = pkgs.nixops4;
     };
 
     deployment = {

panel/nix/overlay.nix

@@ -8,4 +8,17 @@ let
 in
 {
   python3 = prev.lib.attrsets.recursiveUpdate prev.python3 { pkgs = extraPython3Packages; };
+  nixops4 =
+    let
+      sources = import ../../npins;
+      inherit (import sources.flake-inputs) import-flake;
+      inherit
+        (import-flake {
+          src = ../../.;
+        })
+        inputs
+        ;
+      inherit (inputs) nixops4;
+    in
+    nixops4.packages.${prev.system}.default;
 }

panel/nix/tests.nix

@@ -13,7 +13,6 @@ let
       secrets = {
         SECRET_KEY = pkgs.writeText "SECRET_KEY" "secret";
       };
-      nixops4Package = pkgs.hello; # FIXME: actually pass NixOps4
     };
 
     virtualisation = {