refactor(docker): rename CP_HOST_BACK to CP_APP_HOSTNAME

docker/production/web-server/entrypoint.sh

 #!/bin/sh
-if [ -z "${CP_HOST_BACK}" ]
+if [ -z "${CP_APP_HOSTNAME}" ]
 then
-	echo "CP_HOST_BACK is empty, using default"
-	CP_HOST_BACK="back"
+	echo "CP_APP_HOSTNAME is empty, using default"
+	CP_APP_HOSTNAME="app"
 fi
 
-sed -i "s/CP_HOST_BACK/${CP_HOST_BACK}/" /etc/nginx/nginx.conf
+sed -i "s/CP_APP_HOSTNAME/${CP_APP_HOSTNAME}/" /etc/nginx/nginx.conf
 nginx -g "daemon off;"

docker/production/web-server/nginx.conf

@@ -27,7 +27,7 @@ http {
     real_ip_header    X-Real-IP;
 
     upstream php-handler {
-        server CP_HOST_BACK:9000;
+        server CP_APP_HOSTNAME:9000;
     }
 
     server {