Updates Dockerfile to use upstream jekyll/jekyll Docker image

Author: Ryan Prior

Dockerfile

@@ -1,25 +1,12 @@
-FROM ruby:2.7-buster
-
-# Install program to configure locales as per
-# https://github.com/jekyll/jekyll/issues/4268#issuecomment-167406574
-RUN apt-get update && apt-get install -y locales
-RUN dpkg-reconfigure locales && \
-  locale-gen C.UTF-8 && \
-  /usr/sbin/update-locale LANG=C.UTF-8
-
-# Install needed default locale for Makefly
-RUN echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen && locale-gen
+FROM jekyll/jekyll:4
 
 # Set default locale for the environment
 ENV LC_ALL C.UTF-8
 ENV LANG en_US.UTF-8
 ENV LANGUAGE en_US.UTF-8
 
-RUN mkdir -p /opt/io/elementary/releases
-WORKDIR /opt/io/elementary/releases
-
-COPY Gemfile ./
-RUN gem install jekyll && bundle install
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
 
 ENTRYPOINT ["/usr/local/bin/bundle", "exec", \
   "jekyll", "serve",   \

bin/serve

@@ -2,6 +2,6 @@
 
 cd $(git rev-parse --show-toplevel) # work from repo dir
 docker run --rm -it \
-       -v $(pwd):/opt/io/elementary/releases/ \
+       -v $(pwd):/srv/jekyll/ \
        -p 4000:4000 \
        io.elementary.releases