Add Dockerfile and entrypoint script

Dockerfile

@@ -0,0 +1,8 @@
+FROM ubuntu:latest
+
+RUN apt-get update && apt-get install -y software-properties-common openresolv iptables iproute2
+RUN add-apt-repository ppa:wireguard/wireguard && apt-get update && apt-get install -y wireguard-tools
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

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+#!/bin/bash
+
+set -e
+
+interfaces=`find /etc/wireguard -type f`
+if [[ -z $interfaces ]]; then
+    echo "No interface found in /etc/wireguard" >&2
+    exit 1
+fi
+
+interface=`echo $interfaces | head -n 1`
+
+wg-quick up $interface
+
+shutdown () {
+    wg-quick down $interface
+    exit 0
+}
+
+trap shutdown SIGTERM SIGINT SIGQUIT
+
+sleep infinity &
+wait $!