Update: Tugboat

Steps to update Tugboat when a new core release is out

• Go to the latest base preview page: https://dashboard.tugboat.qa/60815f1e7ceac0f234c0071e (only authorized people have access to this - if you need access, ask us in our Zulip chat).
• From the Actions dropdown, click Rebuild...
  • Tick the Yes, rebuild this preview checkbox
  • Click the Rebuild button
• While the base preview is rebuilding, go to the backdrop-ops/tugboat-demos page: https://dashboard.tugboat.qa/5fa46514c62ba02c640d3a67
• For each regular preview, click Actions > Delete..., then Yes.

NOTE: When the base preview is rebuilt, the other previews all expand to full-size and can make our quota go over the limit. We can therefore either rebuild them as well, or delete them. Since rebuilding them causes them to go back to the default state and lose all customisation, we just delete them.