Machine status page: Add link to build step

Dependencies

• [2] RFGPN7U7 Machine status: Don't show removed machines anymore
• [3] SMCOU72F hydra: add some admin for adding/enabling/etc build machines
• [4] J4R2VCPP Fix showing build steps in the machine status page
• [5] V6S6OYIA Formatting tweaks
• [6] HTL6HIBM machine-status: Read /etc/nix.machines instead of using the BuildMachines table
• [*] ZWCTAZGL added newsitems, added some admin options to clear various caches.
• [*] FFEH62DE Machine status page now looks much better and more consistent with rest of Hydra

Change contents

• edit in src/root/machine-status.tt at line 5
  [9.77]

  [3.192]
  + <thead>

  + <tr>

  + <th>Job</th>

  + <th>System</th>

  + <th>Build</th>

  + <th>Step</th>

  + <th>What</th>

  + <th>Since</th>

  + </tr>

  + </thead>
• replacement in src/root/machine-status.tt at line 19
  [3.234]→[3.234:259](∅→∅)
  − <th colspan="5">
  [3.234]

  [2.403]
  + <th colspan="6">
• edit in src/root/machine-status.tt at line 37
  [3.1149]

  [3.1149]
  + <td><a class="row-link" href="[% c.uri_for('/build' step.build.id 'nixlog' step.stepnr 'tail-reload') %]">[% step.stepnr %]</a></td>