Return Dockerfile to using conda/mamba

Dockerfile

@@ -3,6 +3,7 @@ FROM centos:8
 ENV PYTHONDONTWRITEBYTECODE=true
 ENV BASH_ENV ~/.bashrc
 SHELL ["/bin/bash", "-c"]
+ENV PATH=${PATH}:/mamba/bin
 
 # CENTOS 8 has reached end of life - Not yet an updated Docker base for CentOS stream
 # Point to the CentOS 8 vault in order to download dependencies
@@ -13,20 +14,35 @@ RUN cd /etc/yum.repos.d/ && \
 
 # Development tools including compilers
 RUN yum groupinstall "Development Tools" -y --nogpgcheck && \
-    yum install -y --nogpgcheck mesa-libGL libXt libXt-devel wget gcc-gfortran lapack vim tmux cmake && \
+    yum install -y --nogpgcheck mesa-libGL libXt libXt-devel wget gcc-gfortran lapack vim tmux && \
     yum clean all
 
-RUN yum install -y yum-utils
-
-RUN yum config-manager  --add-repo https://yum.repos.intel.com/mkl/setup/intel-mkl.repo
-RUN yum install -y intel-mkl-2020.0-088
+# Install Mamba
+# Swapped from Conda to Mamba due to Github runner memory constraint
+RUN wget --no-check-certificate https://github.com/conda-forge/miniforge/releases/latest/download/Mambaforge-Linux-x86_64.sh -O /mamba.sh && \
+    chmod +x /mamba.sh && \
+    /mamba.sh -b -p /mamba/ && \
+    rm /mamba.sh && hash -r
 
 ADD / /sharpy_dir/
 
+# Update mamba and make it run with no user interaction
+# Cleanup mamba installation
+RUN mamba init bash
+RUN mamba config --set always_yes yes --set changeps1 no
+RUN mamba update -q conda
+RUN mamba config --set auto_activate_base false
+RUN mamba env create -f /sharpy_dir/utils/environment.yml && mamba clean -afy && \
+
+    find /mamba/ -follow -type f -name '*.a' -delete && \
+    find /mamba/ -follow -type f -name '*.pyc' -delete && \
+    find /mamba/ -follow -type f -name '*.js.map' -delete
+
 #COPY /utils/docker/* /root/
 RUN ln -s /sharpy_dir/utils/docker/* /root/
 
 RUN cd sharpy_dir && \
+    mamba activate sharpy && \
     git submodule update --init --recursive && \
     mkdir build && \
     cd build && \