connect: install TensorFlow Serving

[aronatkins]

Install TensorFlow Serving into the Connect Ubuntu 22 image. This can be done with commands similar to:

RUN echo "deb [arch=amd64] http://storage.googleapis.com/tensorflow-serving-apt stable tensorflow-model-server tensorflow-model-server-universal" > /etc/apt/sources.list.d/tensorflow-serving.list && \
    curl https://storage.googleapis.com/tensorflow-serving-apt/tensorflow-serving.release.pub.gpg | apt-key add -
RUN export DEBIAN_FRONTEND=noninteractive && \
    apt-get update && \
    apt-get install -y \
    tensorflow-model-server-universal \
    && rm -rf /var/lib/apt/lists/*

This is installing tensorflow-model-server-universal not tensorflow-model-server, as the universal binary has basic optimizations, but no platform-specific instructions.

Additional details about TensorFlow Serving installation: https://www.tensorflow.org/tfx/serving/setup

Connect will separately enable TensorFlow Serving; see #777.

[aronatkins]

Closing, as #785 has merged.