another reorg; add options for full or minimal helix install

configuration/modules/virtualisation.nix

@@ -0,0 +1,26 @@
+{ ... }:
+
+{
+  virtualisation = {
+    containers = {
+      # Enable common container config files in /etc/containers
+      enable = true;
+    };
+    libvirtd = {
+      enable = true;
+    };
+    # remember to add the necessary users to the podman group
+    podman = {
+      enable = true;
+      # Create a `docker` alias for podman, to use it as a drop-in replacement
+      dockerCompat = true;
+      # Required for containers under podman-compose to be able to talk to each other.
+      defaultNetwork.settings.dns_enabled = true;
+    };
+    waydroid = {
+      enable = true;
+    };
+  };
+  programs.virt-manager.enable = true;
+}
+