include submmodules

Author: jepler

.github/workflows/images.yml

@@ -21,6 +21,8 @@ jobs:
       run: echo "$GITHUB_CONTEXT"
 
     - uses: actions/[email protected]
+      with:
+        submodules: true
 
     - name: Set up Python 3.9
       uses: actions/setup-python@v1