Add WP-CLI and update to php8.4

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -4,9 +4,15 @@ ARG PHP_VERSION=8.4
 
 FROM wordpress:php${PHP_VERSION} AS upstream
 
+WORKDIR /tmp
 RUN pecl install redis apcu; \
     docker-php-ext-enable redis apcu;
 
+RUN curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar; \
+    chmod +x wp-cli.phar; \
+    mv wp-cli.phar /usr/local/bin/wp;
+
+
 FROM upstream AS runtime
 
 WORKDIR /var/www/html