Create Dockerfile

Dockerfile

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+# Use an official Python runtime as a parent image
+FROM python:3.9-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the requirements file first to leverage Docker cache
+COPY requirements.txt .
+
+# Install any needed packages specified in requirements.txt
+# --no-cache-dir reduces image size, --upgrade pip ensures pip is up-to-date
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Copy all files from the build context (app.py, etc.) into the working directory
+COPY . .
+
+# Create necessary directories that the app will use, as per user guidance
+# 'data' for persistent items (template, font, config)
+# 'downloads' for temporary raw images
+# 'session' for the Telethon session file
+RUN mkdir -p ./data ./downloads ./session && \
+    chmod -R 777 ./data ./downloads ./session
+
+# Command to run the application when the container launches
+CMD ["python", "app.py"]