syntax = docker/dockerfile:1.8 を使うとコンテナイメージビルド内のassets:precompileが失敗する

[takaishi]

GHA Workflowでのみ発生。手元だと再現できていない。1.7に戻すと成功する。

 > [asset-compile 16/16] RUN --mount=type=cache,uid=1000,target=/app/tmp/cache SECRET_KEY_BASE=hoge RAILS_ENV=production DB_ADAPTER=nulldb bin/rails assets:precompile:
46.73     ERROR in ./app/javascript/stylesheets/cndt2023.scss (./node_modules/css-loader/dist/cjs.js??ref--6-1!./node_modules/postcss-loader/src??ref--6-2!./node_modules/sass-loader/dist/cjs.js??ref--6-3!./app/javascript/stylesheets/cndt2023.scss)
46.73     Module build failed (from ./node_modules/postcss-loader/src/index.js):
46.73     Error: No PostCSS Config found in: /app
46.73         at /app/node_modules/postcss-load-config/src/index.js:91:15
46.73 
46.73 
46.73 Browserslist: caniuse-lite is outdated. Please run:
46.73   npx browserslist@latest --update-db
46.73   Why you should do it regularly: https://github.com/browserslist/browserslist#browsers-data-updating
46.73 
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https://github.com/cloudnativedaysjp/dreamkast/actions/runs/9581729979