Install php-sqlite for pdo_sqlite; add generator meta tag

Arch splits pdo_sqlite/sqlite3 into a separate php-sqlite package —
installing the sqlite CLI package alone left php.ini's pdo_sqlite
uncomment with no module to enable. pdo_mysql needs no such package;
it ships in core php via the bundled mysqlnd driver.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Dockerfile

@@ -14,7 +14,7 @@ ARG ARCH_SNAPSHOT=2026/07/01
 RUN echo "Server=https://archive.archlinux.org/repos/${ARCH_SNAPSHOT}/\$repo/os/\$arch" \
       > /etc/pacman.d/mirrorlist
 
-RUN pacman -Syyu --noconfirm --needed apache php php-apache sqlite \
+RUN pacman -Syyu --noconfirm --needed apache php php-apache php-sqlite \
     && pacman -Scc --noconfirm
 
 # php-apache on Arch is built against mpm_prefork, not httpd's default