Include libffi-dev in conda image

Author: hc2p

python/conda/Dockerfile.conda

@@ -5,6 +5,7 @@ FROM deepnote/python:${PYTHON_VERSION}${CIRCLE_PULL_REQUEST:+-ra-${CIRCLE_PULL_R
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
         tini  \
+        libffi-dev \
         libglib2.0-0 libxext6 libsm6 libxrender1 && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*