Check if BUILD_ID is available before starting

[timneutkens]

Fixes #300

Added a check for BUILD_ID since it's only there after running next build.

[reel]

Would it be better to trigger a production build instead?

In one of my solution I use:

// app.get('next') is the path to the next folder..

if (app.get('next') && process.env.NODE_ENV === 'production') {
  const builder = require('next/dist/server/build').default;
  builder(app.get('next')).then(() => run()).catch((err) => console.error(err));
}

[rauchg]

@reel that could lead to bad practices (like not separating the build step / pre-building and then having very long bootup times when going to production)

[lock]

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