Add Dockerfile

Dockerfile

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+## Dockerfile for eth-net-intelligence-api (build from git).
+##
+## Build via:
+#
+# `docker build -t ethnetintel:latest .`
+#
+## Run via:
+#
+# `docker run -v <path to app.json>:/home/ethnetintel/eth-net-intelligence-api/app.json ethnetintel:latest`
+#
+## Make sure, to mount your configured 'app.json' into the container at
+## '/home/ethnetintel/eth-net-intelligence-api/app.json', e.g.
+## '-v /path/to/app.json:/home/ethnetintel/eth-net-intelligence-api/app.json'
+## 
+## Note: if you actually want to monitor a client, you'll need to make sure it can be reached from this container.
+##       The best way in my opinion is to start this container with all client '-p' port settings and then 
+#        share its network with the client. This way you can redeploy the client at will and just leave 'ethnetintel' running. E.g. with
+##       the python client 'pyethapp':
+##
+#
+# `docker run -d --name ethnetintel \
+# -v /home/user/app.json:/home/ethnetintel/eth-net-intelligence-api/app.json \
+# -p 0.0.0.0:30303:30303 \
+# -p 0.0.0.0:30303:30303/udp \
+# ethnetintel:latest`
+#
+# `docker run -d --name pyethapp \
+# --net=container:ethnetintel \
+# -v /path/to/data:/data \
+# pyethapp:latest`
+#
+## If you now want to deploy a new client version, just redo the second step.
+
+
+FROM debian
+
+RUN apt-get update &&\
+    apt-get install -y curl git-core &&\
+    curl -sL https://deb.nodesource.com/setup | bash - &&\
+    apt-get update &&\
+    apt-get install -y nodejs
+
+RUN apt-get update &&\
+    apt-get install -y build-essential
+
+RUN adduser ethnetintel
+
+RUN cd /home/ethnetintel &&\
+    git clone https://github.com/cubedro/eth-net-intelligence-api &&\
+    cd eth-net-intelligence-api &&\
+    npm install &&\
+    npm install -g pm2
+
+RUN echo '#!/bin/bash\nset-e\n\ncd /home/ethnetintel/eth-net-intelligence-api\n/usr/bin/pm2 start ./app.json\ntail -f \
+    /home/ethnetintel/.pm2/logs/node-app-out-0.log' > /home/ethnetintel/startscript.sh
+
+RUN chmod +x /home/ethnetintel/startscript.sh &&\
+    chown -R ethnetintel. /home/ethnetintel
+
+USER ethnetintel
+ENTRYPOINT ["/home/ethnetintel/startscript.sh"]