ci: Ensure all generated code is committed (#1570)

When running:

```shell
make build
make test
………
```

There is a whole bunch of generated code that is not committed, which should have been committed. This workflow change ensure the CI jobs fails if any generated code is forgotten to be committed.

Signed-off-by: Marco Franssen <marco.franssen@gmail.com>

Author: marcofranssen

.github/workflows/main.yaml

@@ -63,6 +63,11 @@ jobs:
           go-version-file: go.mod
           cache-dependency-path: go.sum
 
+      - name: Ensure all generated code is committed
+        run: |
+          make generate manifests docs-update
+          git diff --exit-code
+
       - name: Check shell scripts
         run: make shellcheck