feat: migrate all nixos services from idols to 12kingdoms

hosts/12kingdoms-suzu/microvm/mitsuha/default.nix

@@ -0,0 +1,67 @@
+{mylib, ...}: {
+  imports =
+    (mylib.scanPaths ./.)
+    ++ [
+      ../../../../modules/nixos/base/ssh.nix
+      ../../../../modules/nixos/base/user-group.nix
+      ../../../../modules/base.nix
+    ];
+
+  microvm = {
+    mem = 1024; # RAM allocation in MB
+    vcpu = 1; # Number of Virtual CPU cores
+
+    interfaces = [
+      {
+        type = "tap";
+        id = "vm-mitsuha"; # should be prefixed with "vm-"
+        mac = "02:00:00:00:00:02"; # Unique MAC address
+      }
+    ];
+
+    # Block device images for persistent storage
+    # microvm use tmpfs for root(/), so everything else
+    # is ephemeral and will be lost on reboot.
+    #
+    # you can check this by running `df -Th` & `lsblk` in the VM.
+    volumes = [
+      {
+        mountPoint = "/var";
+        image = "var.img";
+        size = 512;
+      }
+      {
+        mountPoint = "/etc";
+        image = "etc.img";
+        size = 50;
+      }
+    ];
+
+    # shares can not be set to `neededForBoot = true;`
+    # so if you try to use a share in boot script(such as system.activationScripts), it will fail!
+    shares = [
+      {
+        # It is highly recommended to share the host's nix-store
+        # with the VMs to prevent building huge images.
+        # a host's /nix/store will be picked up so that no
+        # squashfs/erofs will be built for it.
+        #
+        # by this way, /nix/store is readonly in the VM,
+        # and thus the VM can't run any command that modifies
+        # the store. such as nix build, nix shell, etc...
+        # if you want to run nix commands in the VM, see
+        # https://github.com/astro/microvm.nix/blob/main/doc/src/shares.md#writable-nixstore-overlay
+        tag = "ro-store"; # Unique virtiofs daemon tag
+        proto = "virtiofs"; # virtiofs is faster than 9p
+        source = "/nix/store";
+        mountPoint = "/nix/.ro-store";
+      }
+    ];
+
+    hypervisor = "qemu";
+    # Control socket for the Hypervisor so that a MicroVM can be shutdown cleanly
+    socket = "control.socket";
+  };
+
+  system.stateVersion = "23.11";
+}