Dockerfile [docker in a nutshell]

Dockerfile

# use ubuntu as a base image
FROM ubuntu

# add custom label
LABEL ARTICLE_NAME="docker in a nutshell"

# add environment variable
ENV PUBLISHING_AT=medium

# copy src directory from build context to my-app in container
COPY /src /my-app

# make my-app default directory for the upcoming commands
WORKDIR /my-app

# print contents
CMD ["ls", "-l"]