feat: Add systemd-sysext

modules/profiles/server.nix

@@ -7,6 +7,7 @@
   imports = [
     (modulesPath + "/profiles/minimal.nix")
     ./network.nix
+    ./sysext.nix
   ];
 
   boot.kernel.sysctl = {

modules/profiles/sysext.nix

@@ -0,0 +1,23 @@
+{ ... }:
+{
+  system.activationScripts.sysext = ''
+    mkdir -p /var/lib/confexts
+    mkdir -p /var/lib/extensions
+    mkdir -p /etc/systemd/extensions
+  '';
+
+  systemd.additionalUpstreamSystemUnits = [
+    "systemd-confext.service"
+    "systemd-sysext.service"
+  ];
+
+  systemd.services."systemd-confext" = {
+    enable = true;
+    wantedBy = [ "multi-user.target" ];
+  };
+
+  systemd.services."systemd-sysext.service" = {
+    enable = true;
+    wantedBy = [ "multi-user.target" ];
+  };
+}