added disko configuration

hosts/linode/disko.nix

@@ -0,0 +1,32 @@
+{ lib, ... }:
+
+{
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        device = "/dev/sda";
+
+        content = {
+          type = "gpt";
+
+          partitions = {
+            boot = {
+              size = "1M";
+              type = "EF02";
+            };
+
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}