Added Dockerfile for HF space deployment

Dockerfile

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+# read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
+# you will also find guides on how best to write your Dockerfile
+FROM tensorflow/tensorflow:2.4.2-gpu
+
+# fix for broken keys in Ubuntu-18.04
+RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/3bf863cc.pub
+
+# install Python 3.7
+RUN apt-get update && apt-get install -y --no-install-recommends software-properties-common \
+    libsm6 libxext6 libxrender-dev curl \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN echo "**** Installing Python ****" && \
+    add-apt-repository ppa:deadsnakes/ppa &&  \
+    apt-get install -y build-essential python3.7 python3.7-dev python3-pip && \
+    curl -O https://bootstrap.pypa.io/get-pip.py && \
+    python3.7 get-pip.py && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /code
+
+RUN apt-get update -y
+RUN apt install git --fix-missing -y
+
+# install dependencies
+COPY ./demo/requirements.txt /code/demo/requirements.txt
+RUN python3.7 -m pip install --no-cache-dir --upgrade -r /code/demo/requirements.txt
+
+# Install wget
+RUN apt install wget -y
+
+# Set up a new user named "user" with user ID 1000
+RUN useradd -m -u 1000 user
+
+# Switch to the "user" user
+USER user
+
+# Set home to the user's home directory
+ENV HOME=/home/user \
+    PATH=/home/user/.local/bin:$PATH
+
+# Set the working directory to the user's home directory
+WORKDIR $HOME/app
+
+# Copy the current directory contents into the container at $HOME/app setting the owner to the user
+COPY --chown=user . $HOME/app
+
+# Download pretrained parenchyma model
+#RUN wget "https://github.com/andreped/livermask/releases/download/trained-models-v1/model.h5"
+
+# Download test sample
+RUN wget https://github.com/VemundFredriksen/LungTumorMask/releases/download/0.0.1/lung_001.nii.gz
+
+CMD ["python3.7", "demo/app.py"]