add nersc exact version

.github/workflows/build-basic-nersc-image.yml

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+name: Build NERSC Version 
+
+on: workflow_dispatch
+
+jobs:
+  build:
+    name: Build Basic NERSC Image
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+
+      - name: Build & Push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./mpi4py-nersc-version
+          file: ./mpi4py-nersc-version/Dockerfile
+          push: true
+          tags: ghcr.io/lsstdesc/mpi4py-nersc-version
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

mpi4py-nersc-version/Dockerfile

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+FROM ubuntu:latest
+WORKDIR /opt
+
+RUN \
+    apt-get update        && \
+    apt-get install --yes    \
+        build-essential      \
+        gfortran             \
+        python3-dev          \
+        python3-pip          \
+        wget              && \
+    apt-get clean all
+
+ARG mpich=4.0.2
+ARG mpich_prefix=mpich-$mpich
+
+RUN \
+    wget https://www.mpich.org/static/downloads/$mpich/$mpich_prefix.tar.gz && \
+    tar xvzf $mpich_prefix.tar.gz                                           && \
+    cd $mpich_prefix                                                        && \
+    ./configure                                                             && \
+    make -j 4                                                               && \
+    make install                                                            && \
+    make clean                                                              && \
+    cd ..                                                                   && \
+    rm -rf $mpich_prefix
+
+RUN /sbin/ldconfig
+
+RUN python3 -m pip install mpi4py
+