Add ci host config

hosts/ci/configuration.nix

@@ -0,0 +1,8 @@
+{ ... }:
+{
+  imports = [
+    ../../shared/base.nix
+    ../../shared/hardware/vm.nix
+    ../../shared/disko/basic-ext4.nix
+  ];
+}

hosts/ci/state.nix

@@ -0,0 +1,25 @@
+{ lib, modulesPath, ... }:
+{
+  system.stateVersion = "25.05";
+
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [
+    "uhci_hcd"
+    "ehci_pci"
+    "ahci"
+    "virtio_pci"
+    "virtio_scsi"
+    "sd_mod"
+    "sr_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  networking.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}

shared/disko/basic-ext4.nix

@@ -1,7 +1,7 @@
 {
   disko.devices = {
     disk = {
-      main-disk = {
+      main = {
         device = "/dev/sda";
         type = "disk";
         content = {