add bail: true to webpack config

[omonk]

I came across a need for this today and found this ticket #150

[swyxio]

thanks! one option i considered was checking against NODE_ENV:

bail: nodeEnv === 'production'

not sure how helpful that will be since we are only doing builds in this code path. just a thought.

didnt put it in the end. accepting as is

[swyxio]

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