ruby:2.6.4公式サポートから外れているため、バージョンアップした方が良いです。

rubyのDocker Imageのサポートリストはこちら。 https://hub.docker.com/_/ruby

rails newをするときに下記エラーが起こる(nodeのバージョンが低い)ためバージョンアップ希望です。

yarn add v1.12.3
info No lockfile found.
[1/4] Resolving packages...
warning @rails/webpacker > node-sass > request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
warning @rails/webpacker > node-sass > node-gyp > request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
warning @rails/webpacker > node-sass > node-gyp > tar@2.2.2: This version of tar is no longer supported, and will not receive security updates. Please upgrade asap.
warning @rails/webpacker > node-sass > request > har-validator@5.1.5: this library is no longer supported
warning @rails/webpacker > node-sass > request > uuid@3.4.0: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
warning @rails/webpacker > webpack > watchpack > watchpack-chokidar2 > chokidar@2.1.8: Chokidar 2 does not receive security updates since 2019. Upgrade to chokidar 3 with 15x fewer dependencies
warning @rails/webpacker > postcss-preset-env > postcss-color-functional-notation > postcss-values-parser > flatten@1.0.3: flatten is deprecated in favor of utility frameworks such as lodash.
warning @rails/webpacker > webpack > micromatch > snapdragon > source-map-resolve@0.5.3: See https://github.com/lydell/source-map-resolve#deprecated
warning @rails/webpacker > webpack > node-libs-browser > url > querystring@0.2.0: The querystring API is considered Legacy. new code should use the URLSearchParams API instead.
warning @rails/webpacker > webpack > watchpack > watchpack-chokidar2 > chokidar > fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
warning @rails/webpacker > optimize-css-assets-webpack-plugin > cssnano > cssnano-preset-default > postcss-svgo > svgo@1.3.2: This SVGO version is no longer supported. Upgrade to v2.x.x.
warning @rails/webpacker > webpack > micromatch > snapdragon > source-map-resolve > resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
warning @rails/webpacker > webpack > micromatch > snapdragon > source-map-resolve > urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
warning @rails/webpacker > webpack > micromatch > snapdragon > source-map-resolve > source-map-url@0.4.1: See https://github.com/lydell/source-map-url#deprecated
[2/4] Fetching packages...
error @npmcli/fs@1.1.0: The engine "node" is incompatible with this module. Expected version "^12.13.0 || ^14.15.0 || >=16". Got "10.14.2"
error Found incompatible module
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
Installing dev server for live reloading
         run  yarn add --dev webpack-dev-server from "."
yarn add v1.12.3
info No lockfile found.
[1/4] Resolving packages...
[2/4] Fetching packages...
error http-proxy-middleware@2.0.2: The engine "node" is incompatible with this module. Expected version ">=12.0.0". Got "10.14.2"
error Found incompatible module
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
Webpacker successfully installed 🎉 🍰

oiax / dockers

ruby:2.6.4公式サポートから外れているため、バージョンアップした方が良いです。 #1