docker: add a patch to fix Docker buildkit when using ZFS graph driver.

The patch incorporates changes merged into the upstream in this PR:
moby/moby#43136

(cherry picked from commit 3d25f04)

# Conflicts:
#	pkgs/applications/virtualization/docker/default.nix

pkgs/applications/virtualization/docker/default.nix

@@ -10,7 +10,7 @@ rec {
       , containerdRev, containerdSha256
       , tiniRev, tiniSha256, buildxSupport ? true, composeSupport ? true
       # package dependencies
-      , stdenv, fetchFromGitHub, buildGoPackage
+      , stdenv, fetchFromGitHub, fetchpatch, buildGoPackage
       , makeWrapper, installShellFiles, pkg-config, glibc
       , go-md2man, go, containerd, runc, docker-proxy, tini, libtool
       , sqlite, iproute2, lvm2, systemd, docker-buildx, docker-compose_2
@@ -79,6 +79,16 @@ rec {
 
       extraUserPath = optionals (stdenv.isLinux && !clientOnly) (makeBinPath [ rootlesskit slirp4netns fuse-overlayfs ]);
 
+      patches = [
+        # This patch incorporates code from a PR fixing using buildkit with the ZFS graph driver.
+        # It could be removed when a version incorporating this patch is released.
+        (fetchpatch {
+          name = "buildkit-zfs.patch";
+          url = "https://github.com/moby/moby/pull/43136.patch";
+          sha256 = "1WZfpVnnqFwLMYqaHLploOodls0gHF8OCp7MrM26iX8=";
+        })
+      ];
+
       postPatch = ''
         patchShebangs hack/make.sh hack/make/
       '';