Bug#1003204: set the sticky bit on some InRelease files

[Jakub Wilk]

I'm affected too. It's not just InRelease files:

  # find /var/cache/apt-cacher-ng -type f | wc -l
  185505

  # find /var/cache/apt-cacher-ng -type f -perm /1000 | wc -l
  16447

I've never had FilePerms set in my config.

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Jakub Wilk