add docker files for linux

Author: zhangzhanqun

docker/Dockerfile

@@ -0,0 +1,19 @@
+# Pydyna-pre service Linux-based Dockerfile
+
+FROM python:3.8-slim-buster
+
+# Define the working directory
+WORKDIR /server
+
+# Install unzip
+RUN apt-get update && apt-get install -y unzip
+
+# Add the binary files from the latest release
+COPY linux-binaries.zip .
+RUN unzip -qu linux-binaries.zip && rm linux-binaries.zip
+
+RUN pip3 install grpcio grpcio-tools protobuf
+
+RUN python -m grpc_tools.protoc --python_out=./linux-binaries --grpc_python_out=./linux-binaries -I./linux-binaries ./linux-binaries/kwprocess.proto
+
+CMD ["python3", "./linux-binaries/kwserver.py"]

docker/README.rst

@@ -0,0 +1,47 @@
+Create your own pydyna-pre service docker container
+=================================================
+
+The pydyna-pre service Docker containers can be easily built by following
+these steps.
+
+Inside this folder, the instructions (i.e. ``Dockerfile.*`` files) for
+building the pydyna-pre service Docker containers are made available. 
+
+* ``Dockerfile``: this file builds the Linux-based Docker image.
+
+Prerequisites
+^^^^^^^^^^^^^
+
+* Ensure that ``docker`` is installed in your machine.
+  If you do not have ``docker`` available, please refer to the
+  `official Docker site <https://www.docker.com>`_.
+
+* Download the latest release artifacts for the Linux
+  Docker container. You can do this as follows:
+
+  * Latest Linux artifacts: `linux-binaries.zip <https://github.com/ansys/pydyna/releases/latest/download/linux-binaries.zip>`_
+
+* Move these ``.zip`` files to the current location (i.e. ``<repository-root-folder>/docker``).
+
+Building the Docker images
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In order to build your images, follow the next instructions:
+
+* Locate yourself at ``<repository-root-folder>/docker`` in your terminal.
+* Run the following Docker command:
+
+  .. code:: bash
+
+     docker build -t ls-pre .
+
+* Check that the image has been created successfully. You should see an output similar
+  to this one when running the following command:
+
+  .. code:: bash
+
+     docker images
+
+     >>> REPOSITORY                                               TAG                                IMAGE ID       CREATED          SIZE
+     >>> ls-pre                                                   *******-latest                     ............   X seconds ago    187MB
+     >>> ......                                                   ......                             ............   ..............   ......