Creating jekyll docker with preinstalled dependencies

Dockerfile

FROM ruby:2.5-alpine

# Install C dependencies and Jekyll
RUN apk add --no-cache build-base gcc bash cmake
RUN gem install jekyll


# Building with Gems installed to eliminate bundle installation every time
WORKDIR /site
COPY Gemfile .

RUN bundle install

# Expose port 4000 which is jekyll in-built server's port
EXPOSE 4000

# Serve jekyll application at port 4000
CMD [ "jekyll", "serve", "--force_polling", "-P", "4000" ]