feat: install jemalloc to replace glibc malloc for reduced memory fragmentation

Co-Authored-By: gl_anatolii.yatsuk <gl_anatolii.yatsuk@airbyte.io>

Author: devin-ai-integration[bot]

Dockerfile

@@ -24,6 +24,12 @@ RUN pip install dist/*.whl
 # This is a no-op unless DD_PROFILING_ENABLED or similar env vars are set at runtime.
 RUN pip install "ddtrace>=2.16,<3"
 
+# Install jemalloc to replace glibc's malloc. jemalloc returns freed memory to the OS
+# much more aggressively than glibc, preventing unbounded RSS growth in long-running syncs
+# caused by native C allocation fragmentation (urllib3, OpenSSL, orjson, etc.).
+RUN apt-get update && apt-get install -y --no-install-recommends libjemalloc2 && rm -rf /var/lib/apt/lists/*
+ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
+
 # Recreate the original structure
 RUN mkdir -p source_declarative_manifest \
     && echo 'from source_declarative_manifest.run import run\n\nif __name__ == "__main__":\n    run()' > main.py \