# Dockerfile to build and serve a jekyll site with the development webserver
FROM ubuntu:focal
LABEL Description="This image is used for developing Jekyll sites." \
      Author="david@socialnerds.org" \
      Version="0.1" \
      License="MIT"

# environment variables
ENV USER_ID=1000
ENV GROUP_ID=1000
ENV USERNAME=jekyll-dev

# expose port for jekyll development webserver
EXPOSE 4000

# volume definitions
VOLUME ["/mnt"]

# prepare the baseimage
RUN apt-get update && apt-get install -y ruby ruby-dev gcc g++ make libssl-dev libreadline-dev python3 && \
    gem update && gem install jekyll bundler && \
    groupadd -g $GROUP_ID $USERNAME && \
    useradd -u $USER_ID -g $GROUP_ID -m -d /home/$USERNAME -s /bin/false $USERNAME

# set working directory
WORKDIR /mnt

# set executing user name
USER $USERNAME

# run jekyll script
CMD python3 -m http.server -d _site 4000