Running Dockerfile with CMD supervisor in App Platform

I have a project with a Dockerfile that roughly has the following:

FROM php:7.2-apache

# supervisor installation &&
# create directory for child images to store configuration in
RUN apt-get -y install supervisor && \
  mkdir -p /var/log/supervisor && \
  mkdir -p /etc/supervisor/conf.d

# supervisor configurations
ADD /.docker/conf/supervisor/conf.d/apache.conf /etc/supervisor/conf.d/apache.conf
ADD /.docker/conf/supervisor/conf.d/Emails.conf /etc/supervisor/conf.d/Emails.conf

# Docker will start only supervisord
CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/supervisor.conf"]

apache.conf is supervisor keeping apache alive and Emails.conf is Laravel’ s queue:work command kept alive.

However my app in App Platform fails with:

2021-12-03T10:31:17.440161328Z Unlinking stale socket /var/run/supervisor.sock 2021-12-03T10:31:17.741289162Z Error: Another program is already listening on a port that one of our HTTP servers is configured to use. Shut this program down first before starting supervisord. 2021-12-03T10:31:17.741327485Z For help, use /usr/bin/supervisord -h

The error occurs only in App Platform, Docker builds the container OK.