CSS chunks are served with max-age=0

[znarf]

Bug report

When using the new integrated CSS support in 9.2.0, CSS chunks are served with max-age=0 in the Cache-Control header.

To Reproduce

• Create a global CSS: _app.css: body { background-color: red }
• Link CSS in _app.js: import './_app.css'
• Build the app: npm run build
• Start the app in production environment: npm run start
• Inspect the Cache-Control header of the CSS chunk being served

Current behavior

public, max-age=0

Expected Behavior

public, max-age=31536000, immutable

System information

• Version of Next.js: 9.2.0

Additional context

It's similar to an issue that was previously raised for the next-css plugin: #5464

[Timer]

Fixed via #10184

[balazsorban44]

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