Specify default mountpoints

lib/modules/partition.nix

@@ -301,6 +301,7 @@
               type = "uefi";
               size = "+1G";
               format = fs.fat32;
+              mountPoint = "/boot";
             };
 
             Swap = {
@@ -312,6 +313,7 @@
               index = 3;
               type = "linux";
               format = fs.ext4;
+              mountPoint = "/";
             };
           };
         };