Fix #4251: TTY mode errors on Pipelines artifact builds #4255
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Motivation
Fixes #4251
Proposed changes
Run Pipelines artifact builds explicitly non-interactively.
Alternatives considered
Chase down whatever component of the Symfony/Robo stack is incorrectly treating Pipelines as an interactive environment when it's not, as it's definitely a bug. Unfortunately I don't have time to chase it down right now.
Coincidentally, the other major open bug in the BLT queue is about Drupal Check, which was the last component to have TTY problems. Maybe there's some useful info here if anyone wants to dive in: mglaman/drupal-check#135
Testing steps
Apply this PR as patch, run a Pipelines build with a deploy step.