test fixup for missing yq in CI check

Author: amisevsk

.github/workflows/pr.yml

@@ -61,11 +61,11 @@ jobs:
       name: Check manifests
       run: |
         git reset HEAD --hard
-
+        pip install yq
         # Note: fmt is necessary after generate since generated sources will
         #       fail format check by default.
         make generate fmt manifests
-        if [[ $? != 0 ]]
+        if [[ ! -z $(git status -s) ]]
         then
           echo "generated sources are not up to date"
           exit 1