Exit if dyndns not set - Githubissues

If dyndns is not propertly get from the dappmanager API, the wireguard app should exit with an error so the container keep restarting until it gets the dynds.

TODO

[ ] At the script 30-config add something similar to

# Exit if SERVERURL not set
[ -z "$SERVERURL" ] && { echo "**** ERROR: External server address not found at my.dappnode/global-envs/HOSTNAME ****"; exit 1}

[ ] Add env var to exit on error in dockerfile S6_BEHAVIOUR_IF_STAGE2_FAILS https://github.com/dappnode/DNP_WIREGUARD/pull/19#discussion_r695798820

dappnode / DNP_WIREGUARD

Exit if dyndns not set #20

TODO