Removed all libs as it is supposed to be a baseline and not the whole image

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

Dockerfile

@@ -7,4 +7,6 @@ RUN apt-get update \
     && rm /tmp/modpagespeed.deb \
     && service apache2 restart \
     && mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini" \
-    && docker-php-ext-install -j$(nproc) opcache pdo_mysql mysqli pdo_pgsql pgsql
+    && docker-php-ext-install -j$(nproc) opcache \
+    && apt-purge -y wget $(apt-mark showauto) \
+    && rm -rf /var/lib/apt/lists/*