Checkout individual state file to avoid recursion

See: https://progress.opensuse.org/issues/158236

action.yaml

@@ -49,7 +49,8 @@ runs:
       with:
         ref: ${{ inputs.folder }}
         path: ${{ inputs.folder }}
-        fetch-depth: '1'
+        sparse-checkout: |
+          state.json
     - run: rm -rf ${{ inputs.folder }}/.git
       shell: bash
     - name: Render Markdown from configured backlog queries