Add docker stuff.

docker/Dockerfile

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+FROM alpine:3.11 AS build
+
+COPY . /opt/irtt
+
+RUN apk --update add go git
+RUN go get ./opt/irtt
+RUN cd /opt/irtt && go install -v ./cmd/irtt
+
+
+FROM alpine:3.11
+
+COPY --from=build /root/go/bin/irtt /opt
+
+ENTRYPOINT ["/opt/irtt"]
+CMD []

docker/README.md

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+# Docker
+
+It is possible to run IRTT using [Docker](https://docs.docker.com/install/).
+
+
+## Client
+
+The [irtt](irtt) wrapper script is provided to run IRTT using Docker with some
+sane defaults. To use privileged options (i.e. using low ports) you might need
+the adjust the script to run as `root`.
+
+
+## Server
+
+The IRTT server can be run using [Docker
+Compose](https://docs.docker.com/compose/). The `docker-compose.yml` file can be
+used as a starting point to run a public IRTT server.

docker/docker-compose.yml

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+version: '3'
+services:
+  irtt:
+    image: liske/irtt
+    network_mode: host
+    read_only: true
+    user: nobody
+    command: server

docker/irtt

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+#!/bin/sh
+
+USER=nobody
+IMAGE=liske/irtt
+
+exec docker run --rm -it --network=host --read-only "--user=$USER" "$IMAGE" $@