Add franz disko partitioning

hosts/franz/disko.nix

@@ -0,0 +1,73 @@
+{device ? throw "Set this to your disk device, e.g. /dev/sda", ...}: {
+  disko.devices = {
+    disk.main = {
+      inherit device;
+      type = "disk";
+      content = {
+        type = "gpt";
+        partitions = {
+          boot = {
+            name = "boot";
+            size = "1M";
+            type = "EF02";
+          };
+          esp = {
+            name = "ESP";
+            size = "500M";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+            };
+          };
+          swap = {
+            size = "4G";
+            content = {
+              type = "swap";
+              resumeDevice = true;
+            };
+          };
+          root = {
+            name = "root";
+            size = "100%";
+            content = {
+              type = "lvm_pv";
+              vg = "root_vg";
+            };
+          };
+        };
+      };
+    };
+    lvm_vg = {
+      root_vg = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%FREE";
+            content = {
+              type = "btrfs";
+              extraArgs = ["-f"];
+
+              subvolumes = {
+                "/root" = {
+                  mountpoint = "/";
+                };
+
+                "/home" = {
+                  mountOptions = ["compress=zstd"];
+                  mountpoint = "/home";
+                };
+
+                "/nix" = {
+                  mountOptions = ["subvol=nix" "compress=zstd" "noatime"];
+                  mountpoint = "/nix";
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}