pkg: add router-tuto3, openwrt based

pkg/router-tuto3/Dockerfile

@@ -0,0 +1,14 @@
+FROM openwrtorg/rootfs:x86-64-19.07.7
+
+RUN mkdir -p /var/lock/ && opkg update && opkg install \
+    bind-dig \
+    curl \
+    ethtool \
+    luci-proto-wireguard \
+    nano \
+    ssmtp \
+    python \
+    tcpdump \
+  && rm -rf /var/lock \
+  && rm -rf /etc/ssh/ssh_host_*_key* \
+  && echo "alias ip='ip -c'" >> /etc/profile

pkg/router-tuto3/build.yml

@@ -0,0 +1,2 @@
+image: router-tuto3
+network: true