add rpi-port-forward

rpi-port-forward/Dockerfile

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+FROM hypriot/rpi-alpine-scratch:v3.4
+
+MAINTAINER Newnius <newnius.cn@gmail.com>
+
+ARG DEF_REMOTE_PORT=80
+ARG DEF_LOCAL_PORT=80
+
+ENV REMOTE_PORT=$DEF_REMOTE_PORT
+ENV LOCAL_PORT=$DEF_LOCAL_PORT
+
+RUN apk add --no-cache socat
+
+CMD socat tcp-listen:$LOCAL_PORT,reuseaddr,fork tcp:$REMOTE_HOST:$REMOTE_PORT

rpi-port-forward/README.md

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+# forward your traffic behind NAT etc.
+
+```
+docker service create \
+--name socat \
+--publish 81:80 \
+--ENV REMOTE_HOST=example.com \
+--ENV REMOTE_PORT=82 \
+--ENV LOCAL_POST=80 \
+newnius/rpi-port-forward
+```
+
+Ref: [marcnuri/port-forward](https://hub.docker.com/r/marcnuri/port-forward/)