Add zerotier-cli info output to Docker logs

When I first bring up the container, I want to know I'm approving the join request for the right node. I can get the node's ZT address by manually executing `zerotier-cli info` in the node (e.g. with `docker-compose exec zerotier zerotier-cli info`) but just having it in the logs to start with is very convenient.

entrypoint.sh.release

@@ -77,6 +77,8 @@ EOF
 
 chmod +x /healthcheck.sh
 
+echo "zerotier-cli info: $(zerotier-cli info)"
+
 echo "Sleeping infinitely"
 while true
 do