Update Dockerfile to install FFmpeg and implement output directory cleanup in video encoding task

Dockerfile

@@ -6,6 +6,9 @@ ENV PATH="/home/user/.local/bin:$PATH"
 
 WORKDIR /app
 
+# Install FFmpeg
+RUN apt-get update && apt-get install -y ffmpeg
+
 COPY --chown=user ./requirements.txt requirements.txt
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 

video_encoder/worker/tasks.py

@@ -35,4 +35,4 @@ def encode_video_task(job_id: str, input_path: str) -> Optional[str]:
         raise
     finally:
         # Cleanup temporary files after 1 hour
-        pass  # Implement retention policy as needed
+        shutil.rmtree(output_dir, ignore_errors=True)