Use two Dockerfiles, move Docker stuff to /docker

docker/php/Dockerfile

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+# Based on https://github.com/dead-guru/devichan/blob/master/php-fpm/Dockerfile
+
+FROM composer AS composer
+FROM php:8.1-fpm-bullseye
+COPY --from=composer /usr/bin/composer /usr/bin/composer
+COPY . /code
+
+RUN apt-get update && apt-get upgrade -y && apt-get install -y \
+      zlib1g-dev libicu-dev g++ \
+      libjpeg62-turbo-dev \
+      libzip-dev \
+      libpng-dev \
+      libwebp-dev \
+      libfreetype6-dev \
+      libxml2-dev \
+      git \
+      zip \
+      ffmpeg \
+      libonig-dev \
+      unzip \
+      libcurl4-openssl-dev \
+      libmagickwand-dev \
+      gifsicle \
+      graphicsmagick \
+      gettext \
+      imagemagick \
+      locales locales-all \
+      libmagickwand-dev \
+      libmcrypt-dev \
+    && docker-php-ext-configure gd \
+        --with-webp=/usr/include/webp \
+        --with-jpeg=/usr/include \
+        --with-freetype=/usr/include/freetype2/ \
+    && pecl install redis \
+    && pecl install imagick \
+    && pecl install -o -f igbinary \
+    && docker-php-ext-install gd zip opcache intl pdo pdo_mysql mysqli bcmath gettext iconv mbstring curl \
+    && docker-php-ext-enable igbinary redis imagick
+
+
+RUN /code/docker/common-setup.sh
+WORKDIR "/var/www-leftypol"
+CMD ["php-fpm"]
+EXPOSE 9000