feat: add l2tp

l2tp/README.md

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+# l2tp server
+
+
+# ENV
+```shell
+cat > ./l2tp.env <<EOF
+VPN_IPSEC_PSK=PSK
+VPN_USER=USER
+VPN_PASSWORD=PASSWORD
+VPN_PUBLIC_IP=
+VPN_L2TP_NET=
+VPN_L2TP_LOCAL=
+VPN_L2TP_REMOTE=
+VPN_XAUTH_NET=
+VPN_XAUTH_REMOTE=
+VPN_DNS1=
+VPN_DNS2=
+VPN_SHA2_TRUNCBUG=
+EOF
+```
+
+# Docker run
+```shell
+docker run -d --privileged \
+    -p 500:500/udp \
+    -p 4500:4500/udp \
+    --name l2tp \
+    --restart=always \
+    --env-file ${PWD}/l2tp.env \
+    -v /lib/modules:/lib/modules \
+    teddysun/l2tp
+```

l2tp/docker-compose.yml

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+version: "3"
+
+services:
+  l2tp:
+    image: teddysun/l2tp
+    restart: always
+    ports:
+      - "500:500/udp"
+      - "4500:4500/udp"
+    privileged: true
+    volumes:
+      - "/lib/modules:/lib/modules"
+    environment:
+      - "VPN_IPSEC_PSK=${L2TP_PSK}"
+      - "VPN_USER=${L2TP_USER}
+      - "VPN_PASSWORD=${L2TP_PASSWORD}"
+      - "VPN_PUBLIC_IP="
+      - "VPN_L2TP_NET="
+      - "VPN_L2TP_LOCAL="
+      - "VPN_L2TP_REMOTE="
+      - "VPN_XAUTH_NET="
+      - "VPN_XAUTH_REMOTE="
+      - "VPN_DNS1="
+      - "VPN_DNS2="
+      - "VPN_SHA2_TRUNCBUG="