add microvms, and try to set up basics

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

modules/microvm-host.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  inputs,
+  ...
+}:
+let
+  cfg = config.rad-dev.microvm-host;
+  inherit (inputs.microvm.nixosModules) microvm;
+in
+{
+  # imports = [microvm.host];
+  options.rad-dev.microvm-host = {
+    enable = lib.mkEnableOption "microvm-host";
+  };
+  config = lib.mkIf cfg.enable {
+    networking.useNetworkd = true;
+    # microvm.shares = [
+    #   {
+    #     tag = "ro-store";
+    #     source = "/nix/store";
+    #     mountPoint = "/nix/.ro-store";
+    #   }
+    # ];
+    #     systemd.tmpfiles.rules = map (vmHost:
+    #   let
+    #     machineId = lib.addresses.machineId.${vmHost};
+    #   in
+    #     # creates a symlink of each MicroVM's journal under the host's /var/log/journal
+    #     "L+ /var/log/journal/${machineId} - - - - /var/lib/microvms/${vmHost}/journal/${machineId}"
+    # ) (builtins.attrNames lib.addresses.machineId);
+  };
+}