Update Dockerfile to implement multi-stage build

docker/Dockerfile

-FROM ubuntu:22.04
+FROM tensorflow/tensorflow:1.15.0 AS tensorflow
 
 # Set noninteractive mode to prevent prompts during installation
 ENV DEBIAN_FRONTEND=noninteractive
@@ -10,7 +10,7 @@ RUN apt-get update && apt-get install -y \
     curl \
     git \
     build-essential \
-    libcurl4-openssl-dev \
+    libcurl4-openssl-dev || apt-get install -y libcurl4-gnutls-dev \
     libssl-dev \
     libxml2-dev \
     libxt-dev \
@@ -22,13 +22,6 @@ RUN apt-get update && apt-get install -y \
     psmisc \
     && rm -rf /var/lib/apt/lists/*
 
-# Create an RStudio user with sudo access
-RUN useradd -m -s /bin/bash rstudio && echo "rstudio:rstudio" | chpasswd && \
-    usermod -aG sudo rstudio
-
-# Set working directory
-WORKDIR /root
-
 # Install Miniconda
 RUN wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh && \
     bash miniconda.sh -b -p /opt/miniconda && \
@@ -42,7 +35,6 @@ RUN echo "channels:\n  - conda-forge\n  - bioconda\n  - defaults\n  - r" > /root
 
 # Create Conda environment and install dependencies
 RUN conda create --name neuroestimator -y \
-    r-essentials \
     tensorflow=1.15.0 \
     tensorflow-estimator=1.15.1 \
     r-keras=2.3.0.0 \
@@ -54,10 +46,23 @@ RUN conda create --name neuroestimator -y \
     r-remotes \
     'r-reticulate<=1.24'
 
-# Install RStudio Server
-RUN wget https://download2.rstudio.org/server/jammy/amd64/rstudio-server-2024.12.1-563-amd64.deb -O rstudio-server.deb && \
-    dpkg -i rstudio-server.deb || apt-get -f install -y && \
-    rm rstudio-server.deb
+# Rstudio setup
+FROM rocker/rstudio:4.3.3 AS rstudio
+
+# Set environment variables
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PATH="/opt/miniconda/bin:$PATH"
+
+# Copy Tensorflow and Miniconda environment
+COPY --from=tensorflow /opt/miniconda /opt/miniconda
+COPY --from=tensorflow /root/.condarc /root/.condarc
+
+# Create an Rstudio User
+
+RUN id -u rstudio >/dev/null 2>&1 || useradd -m -s /bin/bash rstudio && \
+    echo "rstudio:rstudio" | chpasswd && \
+    usermod -aG sudo rstudio
 
 # Ensure RStudio uses Conda's R
 RUN echo 'export RSTUDIO_WHICH_R="/opt/miniconda/envs/neuroestimator/bin/R"' >> /etc/profile.d/rstudio.sh