Add a zerotier VPN container (#191)

Co-authored-by: Jon Stroud <jon.stroud@keysight.com>

zerotier-one/20-zerotier.sh

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+#!/bin/sh
+CONTAINER=zerotier-one
+# Starts a wireguard container that is deleted after it is stopped.
+# All configs stored in /mnt/data/wireguard
+if podman container exists ${CONTAINER}; then
+  podman start ${CONTAINER}
+else
+  podman run --device=/dev/net/tun --net=host --cap-add=NET_ADMIN --cap-add=SYS_ADMIN --cap-add=CAP_SYS_RAWIO -v /mnt/data/zerotier-one:/var/lib/zerotier-one --name zerotier-one -d bltavares/zerotier
+fi
+

zerotier-one/README.md

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+# Run ZeroTier VPN on your UDM
+
+## Install
+1. Copy 20-zerotier.sh to /mnt/data/on_boot.d
+2. Create directories for persistent Zerotier configuration
+
+   ```
+   mkdir -p /mnt/data/zerotier-one
+   ```
+3. Start the zeriotier container
+   ```
+   podman run -d \
+   --name zerotier-one \
+   --device=/dev/net/tun \
+   --net=host \
+   --cap-add=NET_ADMIN \
+   --cap-add=SYS_ADMIN \
+   --cap-add=CAP_SYS_RAWIO \
+   -v /mnt/data/zerotier-one:/var/lib/zerotier-one \
+   bltavares/zerotier
+   ```
+4. Join your zerotier network
+   ```
+   podman exec zerotier-one zerotier-cli join <your network id>
+   ```