feat: add build env helper functions

[twlite]

import { defineConfig, noBuildOnly } from 'commandkit/config';

// only runs outside the build process, eg: not in `commandkit build`
const setup = noBuildOnly(() => {
  setInterval(() => {
    console.log(`Hello from ${process.pid}`);
  }, 1000);
});

setup();

export default defineConfig({});

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