Add snapshot tests for a basic Drupal project

tests/snapshots/output/drupal/Dockerfile

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+# Do not edit this file. It is automatically generated by https://www.oliverdavies.uk/build-configs.
+
+FROM php:8.1-fpm-bullseye AS base
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+RUN which composer && composer -V
+
+ARG DOCKER_UID=1000
+ENV DOCKER_UID="${DOCKER_UID}"
+
+WORKDIR /app
+
+RUN adduser --disabled-password --uid "${DOCKER_UID}" app \
+  && chown app:app -R /app
+
+USER app
+
+ENV PATH="${PATH}:/app/bin:/app/vendor/bin"
+
+COPY --chown=app:app composer.* ./
+
+################################################################################
+
+FROM base AS build
+
+USER root
+
+
+RUN apt-get update -yqq \
+  && apt-get install -yqq --no-install-recommends \
+    git libpng-dev libjpeg-dev libzip-dev mariadb-client unzip \
+  && rm -rf /var/lib/apt/lists/* /usr/share/doc /usr/share/man \
+  && apt-get clean
+
+RUN docker-php-ext-configure gd --with-jpeg
+
+RUN docker-php-ext-install gd pdo_mysql zip
+
+COPY --chown=app:app phpunit.xml* ./
+
+
+
+USER app
+
+RUN composer validate
+RUN composer install
+
+COPY --chown=app:app tools/docker/images/php/root /
+
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint-php"]
+CMD ["php-fpm"]
+
+
+
+
+################################################################################
+
+FROM nginx:1 as web
+
+EXPOSE 8080
+
+WORKDIR /app
+
+COPY tools/docker/images/web/root /