manatee: Add storage group that owns /mnt/media/public

hosts/manatee/disk-config.nix

@@ -3,6 +3,33 @@
   imports = [ inputs.disko.nixosModules.disko ];
 
   config = {
+    users.groups.storage = { };
+
+    users.users.storage = {
+      isSystemUser = true;
+      description = "storage";
+      group = "storage";
+    };
+
+    systemd.tmpfiles.settings = {
+      "10-media-public" = {
+        "/mnt/media/public" = {
+          d = {
+            # Create directory
+            user = "storage";
+            group = "storage";
+            mode = "2775";
+          };
+          z = {
+            # Ensure permissions are inherited
+            user = "storage";
+            group = "storage";
+            mode = "2775";
+          };
+        };
+      };
+    };
+
     networking.hostId = "0a9474e7"; # Required by ZFS
     disko.devices = {
       disk = {