add source code and readme

build/piefed/piefed-worker/Dockerfile

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+FROM piefed-base AS piefed-worker
+
+# Install additional packages needed for worker container
+RUN apk add --no-cache redis
+
+# Worker-specific Python configuration for background processing
+RUN echo "import sys" > /app/worker_config.py && \
+    echo "sys.path.append('/app')" >> /app/worker_config.py
+
+# Copy worker-specific configuration files
+COPY supervisord-worker.conf /etc/supervisor/conf.d/supervisord.conf
+COPY entrypoint-worker.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Create worker directories and set permissions
+RUN mkdir -p /var/log/supervisor /var/log/celery \
+    && chown -R piefed:piefed /var/log/celery
+
+# Health check for worker container (check celery status)
+HEALTHCHECK --interval=60s --timeout=10s --start-period=60s --retries=3 \
+    CMD su-exec piefed celery -A celery_worker_docker.celery inspect ping || exit 1
+
+# Run as root to manage processes
+USER root
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]