Keep branch pushes off your stations

A Git push to a branch other than your production branch used to roll out to every station linked to the procedure, so work in progress could replace the code running on your line.

• Fixed branch pushes so they still build a preview deployment but no longer reach any station. Only pushes to the production branch roll out automatically.
• Kept the manual path: open a preview deployment in the dashboard and push it to the station you choose when you want to test a branch on real hardware.
• Fixed a deployment that could stay pending forever when its build could not be queued. It now shows as failed, and the other procedures fed by the same repository still get their build.
• Updated the Deployments and Environments docs to describe when a push is built, when it is skipped, and how previews reach a station.