fix(pkg/driverbuilder): fixed docker container output when multiplexed. #305
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What type of PR is this?
/kind bug
Any specific area of the project related to this PR?
/area pkg
What this PR does / why we need it:
When docker container attach is called on a non-tty terminal, stray characters will appear on screen because the docker SDK uses a custom multiplexing protocol allowing STDOUT and STDERR string to be sent to a single stream.
So, we now check if we are running multiplexed and adapt consequently.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?: