Hugo 115.1 and PostCSS do not work well enough to be usable

Progress!
If I begin the build by deleting all the node modules:

    - rm -rf ./node_modules

I can resolve the permission denied error and get back to the good old error about not being able to use postcss with this version of hugo (the latest). Its a spurious error message but a more common one!

" Error: error building site: POSTCSS: failed to transform "scss/main.css" (text/css). Check your PostCSS installation; install with "npm install postcss-cli". See https://gohugo.io/hugo-pipes/postcss/: this feature is not available in your current Hugo version, see https://goo.gl/YMrWcn for more information

[1273](https://gitlab.omis.at/pages/docs/-/jobs/10597#L1273)Cleaning up project directory and file based variables