disable cute output in github-runner

[chlsmith]

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I would love an option to turn off all the cute output that goes to stdout from the github-runner container. We have this running in a container app and it's logged to Azure Log Analytics, which logs a record for every line of output. I only really need errors or actual information, not the cute ASCII art.

Is that possible already? If not, please consider adding a flag to disable all of that.