fix: add Dockerfile and gitea ci pipeline

Dockerfile

@@ -0,0 +1,20 @@
+# Use an official Python runtime as a parent image
+FROM python:3-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the requirements file into the container
+COPY requirements.txt .
+
+# Install any needed packages specified in requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the current directory contents into the container at /app
+COPY . .
+
+# Make port 9080 available to the world outside this container
+EXPOSE 9080
+
+# Run the application using Gunicorn
+CMD ["python3", "app.py"]