Add Dockerfile and docker image build script

Dockerfile

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+FROM alpine:3.6
+
+ENV BIND_ADDRESS=:4050 DATABASE_TYPE=sqlite3 DATABASE_URL=/data/go-neb.db?_busy_timeout=5000
+
+COPY bin/go-neb /go-neb
+
+VOLUME /data
+EXPOSE 4050
+
+ENTRYPOINT ["/go-neb"]

build-docker-image.sh

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+#!/bin/bash
+
+set -e
+
+docker run \
+    --rm \
+    -v "$PWD":/usr/src/myapp \
+    -w /usr/src/myapp \
+    golang:1.8-alpine \
+    sh -c 'apk add --no-cache git gcc musl-dev && go get -u github.com/constabulary/gb/... && gb build -f github.com/matrix-org/go-neb'
+
+docker build -t ${IMAGE_PREFIX}go-neb:latest .