Hydra/25: At job pages, show the hash of the output

Dependencies

• [2] ZI535LI6 * hydra: 'new' UI for project/jobset/job/build
• [*] LBNVQXUB * Build the /build stuff in a separate controller.
• [*] XDDCO6CH * hydra: add dependency list with links to logfiles
• [*] ZILILXXK * Allow scheduled builds to be cancelled. They're not removed from
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• edit in src/lib/Hydra/Controller/Build.pm at line 11
  [5.25]

  [4.157]
  + use Nix;
• edit in src/lib/Hydra/Controller/Build.pm at line 41
  [6.51]

  [4.941]
  +

  + my $pathHash = $c->stash->{available} ? Nix::queryPathHash($build->outpath) : "Not available";

  + $c->stash->{pathHash} = $pathHash;
• edit in src/root/build.tt at line 293
  [2.10034]

  [2.10034]
  + </td>

  + </tr>

  + <tr>

  + <th>Output store path hash:</th>

  + <td>

  + <tt>[% pathHash %]</tt>