Dockerfile

FROM nextcloud:latest

# Change the Apache listening port from 80 to 8080
RUN sed -i 's/Listen 80/Listen 8080/' /etc/apache2/ports.conf && \
    sed -i 's/:80/:8080/' /etc/apache2/sites-available/000-default.conf

# (Optional) Update the user to run as non-root if that was your goal
# USER www-data