Adopt new hierarchy pattern

services/ddclient/configs/ddclient.conf.tpl

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+daemon=300              # check every 300 seconds
+syslog=yes              # log update msgs to syslog
+pid=/var/run/ddclient/ddclient.pid # record PID in file.
+ssl=yes                 # use ssl-support.  Works with
+                        # ssl-library
+postscript=/data/postscript_gotify.sh # run script after updating.  The
+                        # new IP is added as argument.
+use=web
+web=googledomains
+
+##
+## CloudFlare (www.cloudflare.com)
+##
+protocol=cloudflare,       \
+zone=dedicated.contact,    \
+ttl=1,                     \
+login=token,               \
+password=$CLOUDFLARE_TOKEN \
+$CLOUDFLARE_DOMAIN

services/ddclient/secrets/README.md

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+Contains the file `gotify_token`
+Loadded in the postscript_gotify.sh to send a notification when a new IP is found
+
+Contains the file `clourflare_token`
+Token required to access the DNS API of cloudflare

services/ddclient/volumes/data/.gitignore

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+!postscript_gotify.sh

services/ddclient/volumes/data/postscript_gotify.sh

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+#!/bin/bash
+
+if [ "$(cat /data/gotify_previous_ip || true)" != "$1" ]; then
+    echo -n "$1" > /data/gotify_previous_ip
+
+    curl -s "${GOTIFY_ADDRESS%/}/message" \
+        -X POST \
+        -H "X-Gotify-Key: $GOTIFY_TOKEN" \
+        -F "title=IP Address updated" \
+        -F "message=IP address detected as $1" \
+        -F "priority=5"
+fi

services/ddclient/volumes/init/.gitignore

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+!entrypoint.sh

services/ddclient/volumes/init/entrypoint.sh

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+#!/bin/bash
+
+# usage: file_env VAR [DEFAULT]
+#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
+# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
+#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
+file_env() {
+	local var="$1"
+	local fileVar="${var}_FILE"
+	local def="${2:-}"
+	if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
+		mysql_error "Both $var and $fileVar are set (but are exclusive)"
+	fi
+	local val="$def"
+	if [ "${!var:-}" ]; then
+		val="${!var}"
+	elif [ "${!fileVar:-}" ]; then
+		val="$(< "${!fileVar}")"
+	fi
+	export "$var"="$val"
+	unset "$fileVar"
+}
+
+apk add --update gettext
+
+file_env 'GOTIFY_TOKEN'
+file_env 'CLOUDFLARE_TOKEN'
+
+envsubst < /config/ddclient.conf.tpl > /ddclient.conf