Use images with nbgitpuller for UCMerced

Both the images in use at UCMerced don't have nbgitpuller
installed in them, while the previous combined image did.

I've been working on getting nbgitpuller into upstream
jupyter docker-stacks (jupyter/docker-stacks#2000)
for a while, but it looks like it'll take a bit longer. So
I've temporarily created a repo (https://github.com/2i2c-org/scipy-notebook-with-nbgitpuller/)
to use here. It's based on the same tag as before, but with
nbgitpuller installed. We can get rid of this once nbgitpuller
lands upstream.

I have created https://github.com/2i2c-org/rocker-with-nbgitpuller/
to do the same for use with rocker. This too is a temporary repo.
I hopefully will have a better longer term solution speced out
next week.

This unblocks ucmerced currently teaching.

Ref https://2i2c.freshdesk.com/a/tickets/1089

Author: yuvipanda

config/clusters/2i2c/ucmerced-staging.values.yaml

@@ -12,13 +12,15 @@ jupyterhub:
         description: Start a Python server with JupyterLab and scientific Python stack
         default: true
         kubespawner_override:
-          image: jupyter/scipy-notebook:2023-06-26
+          # From https://github.com/2i2c-org/scipy-notebook-with-nbgitpuller
+          image: quay.io/2i2c/scipy-notebook-with-nbgitpuller:99968bfe6916
           # Launch into JupyterLab after the user logs in
           default_url: /lab
       - display_name: R
         description: Start a R server with tidyverse & Geospatial tools
         kubespawner_override:
-          image: rocker/binder:4.3.1
+          # From https://github.com/2i2c-org/rocker-with-nbgitpuller
+          image: quay.io/2i2c/rocker-with-nbgitpuller:287ea05b2809
           default_url: /lab
           # Ensures container working dir is homedir
           # https://github.com/2i2c-org/infrastructure/issues/2559

config/clusters/2i2c/ucmerced.values.yaml

@@ -12,13 +12,15 @@ jupyterhub:
         description: Start a Python server with JupyterLab and scientific Python stack
         default: true
         kubespawner_override:
-          image: jupyter/scipy-notebook:2023-06-26
+          # From https://github.com/2i2c-org/scipy-notebook-with-nbgitpuller
+          image: quay.io/2i2c/scipy-notebook-with-nbgitpuller:99968bfe6916
           # Launch into JupyterLab after the user logs in
           default_url: /lab
       - display_name: R
         description: Start a R server with tidyverse & Geospatial tools
         kubespawner_override:
-          image: rocker/binder:4.3.1
+          # From https://github.com/2i2c-org/rocker-with-nbgitpuller
+          image: quay.io/2i2c/rocker-with-nbgitpuller:287ea05b2809
           default_url: /lab
           # Ensures container working dir is homedir
           # https://github.com/2i2c-org/infrastructure/issues/2559