make-disk-image: auto-detect bcachefs kernel module like zfs

Automatically include the bcachefs kernel module when bcachefs is detected in
extraRootModules or boot.supportedFilesystems.

This follows the same pattern as ZFS.

Fixes #1151

Author: oott123

lib/make-disk-image.nix

@@ -14,6 +14,7 @@ let
   checked = diskoCfg.checkScripts;
 
   configSupportsZfs = config.boot.supportedFilesystems.zfs or false;
+  configSupportsBcachefs = config.boot.supportedFilesystems.bcachefs or false;
   binfmt = diskoLib.binfmt {
     inherit
       diskoLib
@@ -41,6 +42,7 @@ let
           "virtio_rng"
         ]
         ++ (lib.optional configSupportsZfs "zfs")
+        ++ (lib.optional configSupportsBcachefs "bcachefs")
         ++ cfg.extraRootModules;
       kernel = pkgs.aggregateModules (
         [
@@ -50,6 +52,9 @@ let
         ++ lib.optional (
           lib.elem "zfs" cfg.extraRootModules || configSupportsZfs
         ) cfg.kernelPackages.${config.boot.zfs.package.kernelModuleAttribute}
+        ++ lib.optional (lib.elem "bcachefs" cfg.extraRootModules || configSupportsBcachefs) (
+          cfg.kernelPackages.callPackage pkgs.bcachefs-tools.kernelModule { }
+        )
       );
     }
     // lib.optionalAttrs (diskoLib.vmToolsSupportsCustomQemu lib) {