Add Dockerfile

Dockerfile

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+FROM alpine:3.11 as build
+
+RUN apk add --no-cache gcc musl-dev linux-headers openssl-dev make
+
+RUN addgroup -S app && adduser -S -G app app 
+RUN chown -R app:app /opt
+RUN chown -R app:app /usr/local
+
+# There is a bug in CMake where we cannot build from the root top folder
+# So we build from /opt
+COPY --chown=app:app . /opt
+WORKDIR /opt
+
+USER app
+RUN [ "make", "install" ]
+
+FROM alpine:3.11 as runtime
+
+# It is quite helpful to have the redis-cli available 
+# on the proxy to do basic sanity testing
+# curl can be used to fetch redis-cluster endpoints
+# configuration with the kubernete HTTP apis
+RUN apk add --no-cache redis curl ca-certificates
+
+RUN addgroup -S app && adduser -S -G app app 
+COPY --chown=app:app --from=build /usr/local/bin/redis-cluster-proxy /usr/local/bin/redis-cluster-proxy
+RUN chmod +x /usr/local/bin/redis-cluster-proxy
+RUN ldd /usr/local/bin/redis-cluster-proxy
+
+# Copy source code for gcc
+COPY --chown=app:app --from=build /opt /opt
+
+# Now run in usermode
+USER app
+WORKDIR /home/app
+
+ENTRYPOINT ["/usr/local/bin/redis-cluster-proxy"]
+EXPOSE 7777
+CMD ["redis-cluster-proxy"]