Remove dockerfile from repo

Dockerfile.ci

@@ -1,21 +0,0 @@
-FROM php:8.3-cli
-
-# Install system dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    libfreetype6-dev \
-    libjpeg62-turbo-dev \
-    libpng-dev \
-    unzip \
-    git \
-    curl \
-    && rm -rf /var/lib/apt/lists/*
-
-# Install and configure GD extension
-RUN docker-php-ext-configure gd --with-freetype --with-jpeg \
-    && docker-php-ext-install -j$(nproc) gd
-
-# Install Composer
-RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
-
-# Set working directory
-WORKDIR /workspace