chore: build and push Docker image

.dockerignore

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+.git
+**/node_modules
+*Dockerfile*

Dockerfile

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+FROM node:10 as build
+WORKDIR /usr/src/app
+
+COPY package.json package-lock.json ./
+RUN npm install --production
+
+COPY . ./
+
+FROM node:10-slim
+
+RUN npm install -g moneyd --unsafe-perm
+
+COPY --from=build /usr/src/app /usr/local/lib/node_modules/moneyd/node_modules/moneyd-uplink-xrp
+
+EXPOSE 7768
+ENTRYPOINT [ "/usr/local/bin/moneyd" , "-c", "/root/.moneyd/.moneyd.json" ]

README.md

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 [![Greenkeeper badge](https://badges.greenkeeper.io/interledgerjs/moneyd-uplink-xrp.svg)](https://greenkeeper.io/)
+
+## Run with [Docker](https://docs.docker.com/install/)
+
+```sh
+sudo docker build -t moneyd-xrp .
+sudo docker volume create moneyd-cfg
+sudo docker run --rm -v moneyd-cfg:/root/.moneyd -it moneyd-xrp xrp:configure
+sudo docker run --rm -v moneyd-cfg:/root/.moneyd:ro -e "DEBUG=*" -p 7768:7768 moneyd-xrp xrp:start
+```