[Merge] ~medicalwei/livecd-rootfs:oem-dummy-files into livecd-rootfs:ubuntu/master

[Yao Wei]

Current build failure suggests that the directory make-hooks needs does not exist:

Traceback (most recent call last):
  File "/build/config/hooks.d/make-hooks", line 277, in <module>
    MakeHooks().cli(sys.argv[1:])
  File "/build/config/hooks.d/make-hooks", line 272, in cli
    self.make_hooks(image_sets)
  File "/build/config/hooks.d/make-hooks", line 132, in make_hooks
    self.collect_chroot_hooks()
  File "/build/config/hooks.d/make-hooks", line 144, in collect_chroot_hooks
    chroot_entries = os.listdir(chroot_hooks_dir)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/build/config/hooks.d/chroot'

(Ref: https://launchpadlibrarian.net/682341343/buildlog_ubuntu_mantic_amd64_oem_BUILDING.txt.gz)
-- 
https://code.launchpad.net/~medicalwei/livecd-rootfs/+git/livecd-rootfs/+merge/449317
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