Fixes Dockerfile

Dockerfile

@@ -17,6 +17,8 @@ ENV LE_CONFIG_HOME /acme.sh
 
 ARG AUTO_UPGRADE=1
 
+ENV AUTO_UPGRADE $AUTO_UPGRADE
+
 #Install
 ADD ./ /install_acme.sh/
 RUN cd /install_acme.sh && ([ -f /install_acme.sh/acme.sh ] && /install_acme.sh/acme.sh --install || curl https://get.acme.sh | sh) && rm -rf /install_acme.sh/