Github build fails - suddenly having difficulty with css transforms

support
2

I just tried chaging useResourceCacheWhen to fallback per @jmooring 's post here and it changes the error, but still broken.

Run hugo --minify
Start building sites … 
hugo v0.99.0-1de333e7a3fc863672ec6d6cd53ba66dbcdd2305+extended linux/amd64 BuildDate=2022-05-16T08:10:56Z VendorInfo=gohugoio
Error: Error building site: POSTCSS: failed to transform "css/eureka.css" (text/css): Error: Cannot find module 'postcss-import'
Total in 2013 ms
Require stack:
- /home/runner/work/ttk/ttk/_vendor/wangchucheng.com/hugo-eureka/assets/css/postcss.config.js
- /home/runner/work/ttk/ttk/node_modules/lilconfig/dist/index.js
- /home/runner/work/ttk/ttk/node_modules/postcss-load-config/src/index.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/home/runner/work/ttk/ttk/_vendor/wangchucheng.com/hugo-eureka/assets/css/postcss.config.js:6:9)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/home/runner/work/ttk/ttk/_vendor/wangchucheng.com/hugo-eureka/assets/css/postcss.config.js',
    '/home/runner/work/ttk/ttk/node_modules/lilconfig/dist/index.js',
    '/home/runner/work/ttk/ttk/node_modules/postcss-load-config/src/index.js'
  ]
}
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Error: Process completed with exit code 255.