feat: 초기 도커(PHP 8.3, Nginx, MySQL) 환경 세팅

docker/php/dockerfile

@@ -0,0 +1,19 @@
+FROM php:8.3-fpm
+
+RUN apt-get update && apt-get install -y \
+    git \
+    unzip \
+    libzip-dev \
+    libpng-dev \
+    libonig-dev \
+    libxml2-dev \
+    && docker-php-ext-install pdo_mysql mbstring zip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Composer
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+
+# 3. MySQL 연결을 위한 PHP 확장 모듈 및 기타 필수 모듈 설치
+RUN docker-php-ext-install pdo pdo_mysql mysqli zip
+
+WORKDIR /var/www/html