implement configuration via envvars

fixes #1

Dockerfile

@@ -9,6 +9,7 @@ RUN composer install
 FROM docker.io/php:apache
 
 EXPOSE 9367/tcp
+ENV QUERY_HOST, QUERY_PORT, QUERY_USER_NAMe, QUERY_USER_PASSWORD_FILE
 
 # copy apache configs
 RUN rm /etc/apache2/sites-enabled/* \

src/metrics.php

@@ -22,10 +22,10 @@ $up = $registry->getOrRegisterGauge(
 $up->set(1, []);
 
 
-$host = '192.168.178.55';
-$port = 10011;
-$user = rawurlencode('serveradmin');
-$password = rawurlencode('4NReP1Wf');
+$host = getenv('QUERY_HOST');
+$port = getenv('QUERY_PORT');
+$user = rawurlencode(getenv('QUERY_USER_NAME'));
+$password = rawurlencode(trim(file_get_contents(getenv('QUERY_USER_PASSWORD_FILE'))));
 
 $uri = 'serverquery://'.$user.':'.$password.'@'.$host.':'.$port.'/';