add an option job that run apidiff in client-go and code-generator/ex…

…amples folder

config/jobs/kubernetes/sig-testing/apidiff.yaml

@@ -81,14 +81,7 @@ presubmits:
         args:
         - /bin/sh
         - -c
-        # PULL_BASE_SHA is the revision on the target branch that the
-        # PR gets merged into. What we want instead is the revision at
-        # which the PR branch diverged from the target branch.
-        # We get that from "git merge-base".
-        - "./hack/apidiff.sh -r $(git merge-base ${PULL_BASE_SHA} ${PULL_PULL_SHA}) -t ${PULL_PULL_SHA} ./staging/src/k8s.io/code-generator/examples ./staging/src/k8s.io/client-go"
-        env:
-        - name: REPO_DIR
-          value: /workspace/k8s.io/kubernetes
+        - "./hack/apidiff.sh ./staging/src/k8s.io/code-generator/examples ./staging/src/k8s.io/client-go"
         resources:
           # Memory limits are derived from pull-kubernetes-verify, with less CPUs.
           limits:
@@ -97,6 +90,3 @@ presubmits:
           requests:
             cpu: 2
             memory: 12Gi
-
-# A periodic job which shows API diffs for staging repos since the last release
-# might be useful. Not done yet.