Css file in public/ doesn't contain modifications to sass files

I’m not sure as I’ve not needed to use postcss with any of my sites.

However, this came up from searching the hugo forums

So I think as long as you commit your resources folder, netlify doesn’t need to use postcss.

If the problem is with a netlify deploy, you may find more help in their community Search results for 'postcss' - Netlify Support Forums