Add Gitea Event Bridge application files

Dockerfile

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+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Create non-root user
+RUN useradd --create-home --shell /bin/bash appuser && \
+    chown -R appuser:appuser /app
+
+# Copy application files
+COPY --chown=appuser:appuser . .
+
+# Switch to non-root user
+USER appuser
+
+# Expose port
+EXPOSE 5000
+
+# Run with Gunicorn (4 workers)
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "4", "--timeout", "120", "app:app"]