hydra: error on buildpage for queued build

Dependencies

• [2] MPVX6MKX * hydra: on build page, show tail of log on first tab when buildstatus == 1 (this specific build failed)
• [3] LBNVQXUB * Build the /build stuff in a separate controller.
• [4] HB3OHPJL hydra: in case of cached build, add link to build that built the storepath

Change contents

• replacement in src/lib/Hydra/Controller/Build.pm at line 47
  [2.5]→[2.5:201](∅→∅)
  − (my $lastBuildStep) = $build->buildsteps->search({},{order_by => "stepnr", rows => 1});

  − if ($build->resultInfo->buildstatus == 1 && $lastBuildStep && isValidPath($lastBuildStep->logfile)) {
  [2.5]

  [2.201]
  + (my $lastBuildStep) = $build->buildsteps->search({},{order_by => "stepnr DESC", rows => 1});

  + if (defined $build->resultInfo && $build->resultInfo->buildstatus == 1 && $lastBuildStep && isValidPath($lastBuildStep->logfile)) {