diff --git a/Dockerfile b/Dockerfile
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+#
+# Composer
+#
+FROM composer:2.0.8 as composer
+
+#
+# PHP
+#
+FROM php:8.0.1-cli-alpine3.12 as php-raw
+
+ENV APP_DIR=/opt/app
+ENV PATH=${APP_DIR}/bin:${APP_DIR}/vendor/bin:${PATH}
+
+WORKDIR ${APP_DIR}
+
+#
+# > PHP EXTENSIONS
+#
+ENV PHP_EXT_DIR /usr/local/lib/php/extensions/no-debug-non-zts-20200930
+RUN set -ex \
+    && if [ `pear config-get ext_dir` != ${PHP_EXT_DIR} ]; then echo PHP_EXT_DIR must be `pear config-get ext_dir` && exit 1; fi
+
+FROM php-raw AS php-build
+RUN --mount=type=cache,target=/var/cache/apk \
+    set -ex \
+    && apk add --update-cache \
+        $PHPIZE_DEPS
+
+FROM php-build AS php-ext-zip
+RUN --mount=type=cache,target=/var/cache/apk \
+    set -ex \
+    && apk add \
+        libzip-dev \
+    && docker-php-ext-install zip
+
+FROM php-build AS php-ext-pcntl
+RUN set -ex \
+    && docker-php-ext-install pcntl
+
+FROM php-build AS php-ext-sockets
+RUN set -ex \
+    && docker-php-ext-install sockets
+
+FROM php-build AS php-ext-xdebug
+RUN set -ex \
+    && pecl install xdebug
+
+FROM php-build AS php-ext-pcov
+RUN set -ex \
+    && pecl install pcov
+
+FROM php-build AS php-ext-buffer
+ENV EXT_BUFFER_VERSION 0.1.0
+RUN set -ex \
+    && curl -L https://github.com/phpinnacle/ext-buffer/archive/${EXT_BUFFER_VERSION}.tar.gz | tar xz \
+    && cd ext-buffer-${EXT_BUFFER_VERSION} \
+    && phpize && ./configure && make && make install
+
+FROM php-build AS php-ext-snappy
+ENV EXT_SNAPPY_VERSION 0.2.1
+RUN --mount=type=cache,target=/var/cache/apk \
+    set -ex \
+    && apk add snappy-dev \
+    && curl -L https://github.com/kjdev/php-ext-snappy/archive/${EXT_SNAPPY_VERSION}.tar.gz | tar xz \
+    && cd php-ext-snappy-${EXT_SNAPPY_VERSION} \
+    && ls -al \
+    && phpize && ./configure --with-snappy-includedir=/usr && make && make install
+#
+# < PHP EXTENSIONS
+#
+
+FROM php-raw AS php
+COPY --from=php-ext-zip ${PHP_EXT_DIR}/zip.so ${PHP_EXT_DIR}/
+COPY --from=php-ext-pcntl ${PHP_EXT_DIR}/pcntl.so ${PHP_EXT_DIR}/
+COPY --from=php-ext-sockets ${PHP_EXT_DIR}/sockets.so ${PHP_EXT_DIR}/
+COPY --from=php-ext-xdebug ${PHP_EXT_DIR}/xdebug.so ${PHP_EXT_DIR}/
+COPY --from=php-ext-pcov ${PHP_EXT_DIR}/pcov.so ${PHP_EXT_DIR}/
+COPY --from=php-ext-buffer ${PHP_EXT_DIR}/buffer.so ${PHP_EXT_DIR}/
+COPY --from=php-ext-snappy ${PHP_EXT_DIR}/snappy.so ${PHP_EXT_DIR}/
+
+RUN --mount=type=cache,target=/var/cache/apk \
+    set -ex \
+    && apk add \
+        # composer
+        git \
+        # ext-zip
+        libzip \
+        snappy \
+    && docker-php-ext-enable \
+        buffer \
+        pcntl \
+        pcov \
+        snappy \
+        sockets \
+        zip
+
+ENV COMPOSER_ALLOW_SUPERUSER 1
+ENV COMPOSER_MEMORY_LIMIT -1
+COPY --from=composer /usr/bin/composer /usr/bin/composer