Dockerfile for setting up PHP 8 and xdebug to demonstrate an issue

Dockerfile

FROM ubuntu:20.10

RUN mkdir /app

WORKDIR /app

RUN apt-get update && DEBIAN_FRONTEND=noninteractive \
    apt-get install -qqy --no-install-recommends \
    ca-certificates \
    valgrind \
    gdb \
    build-essential \
    net-tools \
    autoconf \
    bison \
    re2c \
    libxml2-dev \
    libcurl4-openssl-dev \
    libjpeg-dev \
    libpng-dev \
    libxpm-dev \
    libmysqlclient-dev \
    libpq-dev \
    libicu-dev \
    libfreetype6-dev \
    libldap2-dev \
    libxslt-dev \
    libssl-dev \
    libldb-dev \
    libsqlite3-dev \
    libonig-dev \
    nano \
    git \
    wget \
    unzip \
    less \
    curl \
    && rm -rf /var/lib/apt/lists/*

# I am grabbing a copy of master, not checking it out b/c it is HUGE, and I dont want the image to be that large
RUN wget -q https://github.com/php/php-src/archive/master.zip \
  && unzip master.zip \
  && rm master.zip \
  && cd php-src-master \
  && ./buildconf \
  && ./configure --enable-debug --prefix=/app/php/ --with-openssl --with-zlib --enable-mbstring \
  && make -j4 \
  && make install

RUN git clone https://github.com/xdebug/xdebug.git \
  && cd xdebug \
  && /app/php/bin/phpize \
  && ./configure --with-php-config=/app/php/bin/php-config \
  && make \
  && make install

ENV PATH="$PATH:/app/php/bin"

RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/app/php/bin --filename=composer

RUN composer --quiet create-project --no-dev --ignore-platform-reqs laravel/laravel test-laravel-app