[Feature request] switch webpack to development mode when use "--debug"

[Mister-Hope]

Discussed in #530

^{Originally posted by huww98 November 16, 2021}
Hi all, today I spent hours trying to debug the client-side error "Hydration completed but contains mismatches". To view the warnings from vue, I ended up adding the following to my config:

  bundlerConfig: {
    configureWebpack(config, isServer, isBuild) {
      return { mode: 'development' };
    }
  },

How about we can simplify this by enabling the development mode by default when invoked as yarn build --debug

[github-actions]

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[meteorlxy]

I'd ever considered about that, but you know that, --debug and development mode are slightly different. 🤔