Add CI step help debug what the diff is

Author: simonbaird

.github/workflows/checks-codecov.yaml

@@ -69,6 +69,11 @@ jobs:
       - name: Generate
         run: make generate
 
+      # For debugging what actual diff is
+      - name: Show diff
+        run: |
+          git diff --stat --patch
+
       - name: Check for uncommitted changes
         run: |
           git update-index -q --refresh # Avoid false detection of modified files