system: Set flatpak as module

hosts/perso-desktop/configuration.nix

@@ -21,6 +21,7 @@
 
   modules.system = {
     apps = {
+      flatpak.enable = true;
       steam.enable = true;
     };
 

hosts/perso-laptop/configuration.nix

@@ -33,6 +33,10 @@
   };
 
   modules.system = {
+    apps = {
+      flatpak.enable = true;
+    };
+
     desktop = {
       plasma.enable = true;
     };

modules/system/apps/default.nix

@@ -2,6 +2,7 @@
 
 {
   imports = [
+    ./flatpak
     ./steam
   ];
 }

modules/system/apps/flatpak/default.nix

@@ -0,0 +1,17 @@
+{ config, lib, ... }:
+
+with lib;
+let
+  cfg = config.modules.system.apps.flatpak;
+in
+{
+  options.modules.system.apps.flatpak = {
+    enable = mkEnableOption ''
+      Enable flatpak
+    '';
+  };
+
+  config = mkIf cfg.enable {
+    services.flatpak.enable = true; # Important can't be enabled from home-manager
+  };
+}

modules/system/common.nix

@@ -65,8 +65,6 @@
     extraGroups = [ "networkmanager" "wheel" ];
   };
 
-  services.flatpak.enable = true; # Important can't be enabled from home-manager
-
   # Downloads and provides debug symbols and source code for nix derivations to gdb and other debuginfod-capable debuggers as needed.
   # Require https://github.com/symphorien/nixseparatedebuginfod?tab=readme-ov-file#gdb
   services.nixseparatedebuginfod.enable = true;

modules/system/server/docker/default.nix

@@ -14,6 +14,7 @@ in
     virtualisation.docker = {
       enable = true;
     };
+    virtualisation.oci-containers.backend = "docker";
 
     users.users.florian.extraGroups = [ "docker" ];
   };