Add init script

Dockerfile

@@ -21,3 +21,7 @@ RUN git clone https://github.com/jl777/SuperNET && \
   cd SuperNET/iguana && \
   git checkout spvdex && \
   ./m_mm
+
+COPY ./bin /usr/local/bin
+ENTRYPOINT ["init"]
+EXPOSE 7783

bin/init

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+cd ~/SuperNET/iguana
+command ./marketmaker "{\"gui\":\"nogui\",\"client\":1, \"userhome\":\"/${HOME#"/"}\", \"passphrase\":\"$PASSPHRASE\", \"coins\":$COINS}"