fix : install docker-compose plugin from GitHub instead of apt

docker-compose-plugin package is not in Debian default repos.
Download the binary directly from GitHub releases.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

infra/prod/Dockerfile

@@ -40,10 +40,16 @@ FROM php:8.4-fpm AS production
 
 RUN apt-get update && apt-get install -y \
         libicu-dev libpq-dev libpng-dev libzip-dev libxml2-dev \
-        nginx supervisor docker.io docker-compose-plugin \
+        nginx supervisor docker.io curl \
     && docker-php-ext-install -j$(nproc) intl pdo_pgsql zip gd opcache \
     && rm -rf /var/lib/apt/lists/*
 
+# Install Docker Compose plugin
+RUN DOCKER_COMPOSE_VERSION=$(curl -s https://api.github.com/repos/docker/compose/releases/latest | grep '"tag_name"' | sed 's/.*"v\(.*\)".*/\1/') \
+    && mkdir -p /usr/local/lib/docker/cli-plugins \
+    && curl -SL "https://github.com/docker/compose/releases/download/v${DOCKER_COMPOSE_VERSION}/docker-compose-linux-x86_64" -o /usr/local/lib/docker/cli-plugins/docker-compose \
+    && chmod +x /usr/local/lib/docker/cli-plugins/docker-compose
+
 # PHP production config
 RUN mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini"