Adopt new hierarchy pattern

services/gotify/secrets/README.md

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+Contains the file `admin_password`
+
+Envirnonment variable file for the default admin password, this is because gotify doesn't support docker secrets yet
+https://github.com/gotify/server/issues/392

services/gotify/volumes/data/.gitignore

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+!entrypoint.sh

services/gotify/volumes/data/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"
+}
+
+cd /app
+
+file_env 'GOTIFY_DEFAULTUSER_PASS'
+
+./gotify-app "$@"