Error reporting for php docker in browser - php

Question

I am facing an issue where I am trying to run a docker container to practice php on local. When I hit the index php page in the browser after spinning up the container, it does not report error for me when there is an error. It just shows a white screen.
My docker file
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND noninteractive
RUN apt-get update \
&& apt-get install -y tcl locales \
&& locale-gen en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8
RUN apt-get update \
&& apt-get install -y nginx curl zip unzip git software-properties-common supervisor \
&& add-apt-repository -y ppa:ondrej/php \
&& apt-get update \
&& apt-get install -y php7.4-fpm php7.4-cli php7.4-gd php7.4-mysql \
php7.4-imap php7.4-imagick php7.4-opcache php7.4-mbstring php7.4-xml php7.4-zip php7.4-intl php7.4-xmlrpc php7.4-curl \
&& php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer \
&& mkdir /run/php \
&& apt-get remove -y --purge software-properties-common \
&& apt-get -y autoremove \
&& apt-get clean \
&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
&& echo "daemon off;" >> /etc/nginx/nginx.conf
RUN ln -sf /dev/stdout /var/log/nginx/access.log \
&& ln -sf /dev/stderr /var/log/nginx/error.log
COPY default /etc/nginx/sites-available/default
COPY php-fpm.conf /etc/php/7.4/fpm/php-fpm.conf
EXPOSE 88
COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
CMD ["/usr/bin/supervisord"]
Now to report the error please assist in what could be done to fix it?