sed 3

Dockerfile

@@ -3,7 +3,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt update -y
 RUN DEBIAN_FRONTEND=noninteractive apt upgrade -y
 RUN DEBIAN_FRONTEND=noninteractive apt install apache2 php -y
 RUN cat /etc/apache2/ports.conf
-RUN sed -i '0,/Listen 80/Listen 8080/' /etc/apache2/ports.conf
+RUN sed -i 's/Listen 80/Listen 8080/g' /etc/apache2/ports.conf
 RUN cat /etc/apache2/ports.conf
 RUN service apache2 start