Have github action do submodule checkout

Author: Derek Hower

.github/workflows/pages.yml

@@ -20,6 +20,8 @@ jobs:
     steps:
     - name: Clone Github Repo Action
       uses: actions/checkout@v4
+      with:
+        submodules: true
     - name: Setup apptainer
       uses: eWaterCycle/[email protected]
     - name: Get container from cache