Add Dockerfile

Dockerfile

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+FROM mhart/alpine-node:12
+
+ENV PORT 8000
+ENV VERBOSE 'green-tunnel:*'
+ENV SILENT false
+ENV DNS_TYPE 'https'
+ENV DNS_SERVER 'https://cloudflare-dns.com/dns-query'
+
+WORKDIR /green-tunnel
+
+COPY package*.json ./
+RUN npm ci
+
+COPY src ./src
+COPY bin ./bin
+
+EXPOSE 8000/tcp
+
+CMD node ./bin/gt.js \
+	--verbose $VERBOSE \
+	--ip 0.0.0.0 \
+	--port $PORT \
+	--silent $SILENT \
+	--system-proxy false \
+	--dns-type $DNS_TYPE \
+	--dns-server $DNS_SERVER