Don't cache nix-cache-info very long

Dependencies

• [2] AFNDUSGD Set Expires headers for Hydra's binary cache
• [3] XE6HD7BP Provide the nix-cache-info file required by the binary cache substituter
• [4] PRDDAI6W Minor tweak
• [5] EWRCO2ND Give Hydra binary caches a low priority
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/lib/Hydra/Controller/Root.pm at line 247
  [3.61]→[2.0:45](∅→∅)
  − setCacheHeaders($c, 365 * 24 * 60 * 60);
  [3.61]

  [3.259]
  + setCacheHeaders($c, 24 * 60 * 60);