Dockerfile

FROM ruby:2.7-alpine AS build-env

ARG RAILS_ROOT=/app
ARG BUILD_PACKAGES="build-base curl-dev git"
ARG DEV_PACKAGES="postgresql-dev yaml-dev zlib-dev nodejs yarn"
ARG RUBY_PACKAGES="tzdata"
ENV RAILS_ENV=production
ENV NODE_ENV=production
ENV BUNDLE_APP_CONFIG="$RAILS_ROOT/.bundle"
WORKDIR $RAILS_ROOT

RUN apk update \
    && apk upgrade \
    && apk add --update --no-cache $BUILD_PACKAGES $DEV_PACKAGES $RUBY_PACKAGES
COPY Gemfile* package.json yarn.lock ./

COPY Gemfile Gemfile.lock $RAILS_ROOT/
RUN bundle config --global frozen 1 \
    && bundle install --without development:test:assets -j4 --retry 3 --path=vendor/bundle \
    && rm -rf vendor/bundle/ruby/2.7.0/cache/*.gem \
    && find vendor/bundle/ruby/2.7.0/gems/ -name "*.c" -delete \
    && find vendor/bundle/ruby/2.7.0/gems/ -name "*.o" -delete
RUN yarn install --production
COPY . .
RUN bin/rails webpacker:compile
RUN bin/rails assets:precompile
RUN rm -rf node_modules tmp/cache vendor/assets spec


FROM ruby:2.7-alpine
ARG RAILS_ROOT=/app
ARG PACKAGES="tzdata postgresql-client nodejs bash vips-dev vips"
ENV RAILS_ENV=production
ENV BUNDLE_APP_CONFIG="$RAILS_ROOT/.bundle"
WORKDIR $RAILS_ROOT
# install packages
RUN apk update \
    && apk upgrade \
    && apk add --update --no-cache $PACKAGES
COPY --from=build-env $RAILS_ROOT $RAILS_ROOT
EXPOSE 3000
ENV PATH="/app/bin:${PATH}"
CMD ["rails", "server", "-b", "0.0.0.0"]