Update sig-scalability-periodic-dra.yaml to pre-fetch workload image before test begins

Author: alaypatel07

config/jobs/kubernetes/sig-scalability/DRA/sig-scalability-periodic-dra.yaml

@@ -105,6 +105,8 @@ periodics:
           value: "default"
         - name: PROMETHEUS_APISERVER_SCRAPE_PORT
           value: "6443"
+        - name: NODE_PRELOAD_IMAGES
+          value: "gcr.io/k8s-staging-perf-tests/sleep:v0.0.3"
         resources:
           requests:
             cpu: "6"
@@ -143,9 +145,9 @@ periodics:
         repo: kubernetes
         base_ref: master
         path_alias: k8s.io/kubernetes
-      - org: alaypatel07
+      - org: kubernetes
         repo: perf-tests
-        base_ref: dra-kubelet-latencies
+        base_ref: master
         path_alias: k8s.io/perf-tests
     spec:
       serviceAccountName: azure
@@ -221,6 +223,8 @@ periodics:
               value: "6443"
             - name: PROMETHEUS_SCRAPE_KUBELETS
               value: "true"
+            - name: NODE_PRELOAD_IMAGES
+              value: "gcr.io/k8s-staging-perf-tests/sleep:v0.0.3"
           resources:
             requests:
               cpu: "6"