Add Dockerfile for PHP SQLite demo

Dockerfile

@@ -0,0 +1,12 @@
+FROM php:8.2-cli
+
+RUN apt-get update && apt-get install -y --no-install-recommends sqlite3 \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN docker-php-ext-install pdo pdo_sqlite
+
+WORKDIR /app
+COPY . /app
+
+EXPOSE 7860
+CMD ["php", "-S", "0.0.0.0:7860", "-t", "public"]