Add new host "fern"

hosts/fern/disko.nix

@@ -0,0 +1,60 @@
+{
+  disko.devices = {
+    disk.main = {
+      type = "disk";
+      device = "/dev/nvme0n1";
+      content = {
+        type = "gpt";
+        partitions = {
+          ESP = {
+            type = "EF00";
+            size = "512M";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+              mountOptions = [ "defaults" ];
+            };
+          };
+          luks = {
+            size = "100%";
+            content = {
+              name = "cryptroot";
+              type = "luks";
+              settings = {
+                allowDiscards = true;
+                bypassWorkqueues = true;
+              };
+              passwordFile = "/tmp/secret.key";
+              content = {
+                type = "lvm_pv";
+                vg = "pool";
+              };
+            };
+          };
+        };
+      };
+    };
+    lvm_vg.pool = {
+      type = "lvm_vg";
+      lvs = {
+        swap = {
+          size = "20G";
+          content = {
+            type = "swap";
+            resumeDevice = true;
+          };
+        };
+        root = {
+          size = "100%FREE";
+          content = {
+            type = "filesystem";
+            format = "ext4";
+            mountpoint = "/";
+            mountOptions = [ "defaults" ];
+          };
+        };
+      };
+    };
+  };
+}