add source code and readme

build/bookwyrm/bookwyrm-worker/Dockerfile

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+# BookWyrm Worker Container - Production Optimized
+# Celery background task processor
+
+FROM bookwyrm-base AS bookwyrm-worker
+
+# Switch to root for system package installation
+USER root
+
+# Install only supervisor for worker management
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    supervisor \
+    && rm -rf /var/lib/apt/lists/* \
+    && apt-get clean \
+    && apt-get autoremove -y
+
+# Install Celery in virtual environment
+RUN /opt/venv/bin/pip install --no-cache-dir celery[redis]
+
+# Copy worker-specific configuration
+COPY supervisord-worker.conf /etc/supervisor/conf.d/supervisord.conf
+COPY entrypoint-worker.sh /entrypoint.sh
+
+# Set permissions efficiently
+RUN chmod +x /entrypoint.sh \
+    && mkdir -p /var/log/supervisor /var/log/celery \
+    && chown -R bookwyrm:bookwyrm /var/log/celery \
+    && chown -R bookwyrm:bookwyrm /app
+
+# Health check for worker
+HEALTHCHECK --interval=60s --timeout=10s --start-period=60s --retries=3 \
+    CMD /opt/venv/bin/celery -A celerywyrm inspect ping -d celery@$HOSTNAME || exit 1
+
+# Run as root to manage celery via supervisor
+USER root
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]