Added Dockerfile/supervisor, but need to use environmental variables to change domain name

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Dockerfile

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+# sudo docker build -t cowyo .
+# sudo docker run -it -p 8003:8003 -v `pwd`/data:/data cowyo bash
+FROM ubuntu:16.04
+
+# Get basics
+RUN apt-get update
+RUN apt-get -y upgrade
+RUN apt-get install -y golang git wget curl vim
+RUN mkdir /usr/local/work
+ENV GOPATH /usr/local/work
+
+# Install cowyo
+WORKDIR "/root"
+RUN go get github.com/schollz/cowyo
+RUN git clone https://github.com/schollz/cowyo.git
+WORKDIR "/root/cowyo"
+RUN git pull
+RUN go build
+
+# Setup supervisor
+RUN apt-get update && apt-get install -y supervisor
+
+COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+
+# Add Tini
+ENV TINI_VERSION v0.9.0
+ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
+RUN chmod +x /tini
+ENTRYPOINT ["/tini", "--"]
+
+# Startup
+CMD ["/usr/bin/supervisord"]

supervisord.conf

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+[supervisord]
+nodaemon=true
+
+[program:cowyoserver]
+directory=/root/cowyo
+command=/root/cowyo/cowyo -db /data/cowyo.db 127.0.0.1:8003
+priority=1
+stdout_logfile=/root/cowyo/log.out
+stdout_logfile_maxbytes=0
+stderr_logfile=/root/cowyo/log.err
+stderr_logfile_maxbytes=0