[DOP-30579] Improve ivy2 package caching

Author: dolfinus

docker/Dockerfile.worker

@@ -54,6 +54,7 @@ RUN --mount=type=bind,source=./syncmaster/worker/ivy2.py,target=/app/syncmaster/
     python /app/docker/download_ivy2_packages.py s3 && \
     python /app/docker/download_ivy2_packages.py hdfs && \
     python /app/docker/download_ivy2_packages.py clickhouse && \
+    python /app/docker/download_ivy2_packages.py iceberg && \
     python /app/docker/download_ivy2_packages.py postgres && \
     python /app/docker/download_ivy2_packages.py oracle && \
     python /app/docker/download_ivy2_packages.py mssql && \
@@ -77,7 +78,8 @@ COPY --from=builder /app/.venv/ /app/.venv/
 # custom Spark session function may download different jars, so syncmaster have to own them
 COPY --from=ivy2_packages --chown=syncmaster:syncmaster /home/syncmaster/.ivy2/ /home/syncmaster/.ivy2/
 # If someone needs to use worker image with root user, use the same jars
-RUN ln -s /home/syncmaster/.ivy2/ /root/.ivy2/
+RUN mkdir -p /root && \
+    ln -s /home/syncmaster/.ivy2/ /root/.ivy2/
 
 COPY ./syncmaster/ /app/syncmaster/
 RUN python -m compileall syncmaster