Rails 6 Docker Image - Ruby 3, Postgres, Webpack https://hub.docker.com/r/iqbalhasnan/rails-6-dev

Dockerfile

FROM ruby:3.0.2-alpine

ENV ROOT=/var/www/app \
    BUNDLE_PATH=/var/www/app/vendor/bundle
ENV BUNDLE_BIN=$BUNDLE_PATH/bin
ENV PATH $ROOT/bin:$BUNDLE_BIN:$PATH

RUN apk update && apk upgrade && apk add --update --no-cache \
  build-base \
  curl-dev \
  nodejs \
  postgresql-dev \
  tzdata \
  yarn && rm -rf /var/cache/apk/*