Merge pull request #24872 from chaodaiG/doc-boskos

Document why /boskos directory exists, migrate to make rule

boskos/README.md

@@ -3,3 +3,11 @@
 Boskos has been moved into its own repository under kubernetes-sigs:
 
 https://github.com/kubernetes-sigs/boskos
+
+# What's still here
+
+The only thing matters here is `./cmd/janitor/gcp_janitor.py` script, which is
+still used by
+[/scenarios/kubernetes_janitor.py#L66](https://github.com/kubernetes/test-infra/blob/d641897cea52d493ef883a4dfa6728ffdfa02dfa/scenarios/kubernetes_janitor.py#L66),
+and `/scenarios` had been announced deprecated since 2018, which will be done
+with https://github.com/kubernetes/test-infra/issues/20760.

config/jobs/kubernetes/test-infra/test-infra-trusted.yaml

@@ -442,9 +442,13 @@ postsubmits:
     spec:
       serviceAccountName: deployer # TODO(fejta): should be pusher
       containers:
-      - image: gcr.io/k8s-staging-test-infra/bazelbuild:v20210930-b6c4097796-test-infra
+      - image: gcr.io/k8s-staging-test-infra/gcloud-in-go:v20211210-cf89952124
         command:
-        - ./boskos/update_prow_config.sh
+        - make
+        args:
+        - -C
+        - config/prow
+        - update-boskos-resources
     annotations:
       testgrid-dashboards: sig-testing-maintenance
       testgrid-tab-name: boskos-config-upload

config/prow/Makefile

@@ -26,10 +26,10 @@ ZONE_BUILD    ?= us-central1-f
 JOB_NAMESPACE ?= test-pods
 
 update-config: get-cluster-credentials
-	kubectl create configmap config --from-file=config.yaml=config.yaml --dry-run -o yaml | kubectl replace configmap config -f -
+	kubectl create configmap config --from-file=config.yaml=config.yaml --dry-run=client -o yaml | kubectl replace configmap config -f -
 
 update-plugins: get-cluster-credentials
-	kubectl create configmap plugins --from-file=plugins.yaml=plugins.yaml --dry-run -o yaml | kubectl replace configmap plugins -f -
+	kubectl create configmap plugins --from-file=plugins.yaml=plugins.yaml --dry-run=client -o yaml | kubectl replace configmap plugins -f -
 
 deploy-prow: get-cluster-credentials
 	kubectl apply --server-side=true -f ./cluster/prowjob-crd/prowjob_customresourcedefinition.yaml
@@ -38,6 +38,9 @@ deploy-prow: get-cluster-credentials
 deploy-build: get-build-cluster-credentials
 	kubectl apply -f ./cluster/build/
 
+update-boskos-resources: get-build-cluster-credentials
+	kubectl create configmap resources --from-file=config=./cluster/build/boskos-resources.yaml --dry-run=client -o yaml | kubectl --namespace=test-pods replace configmap resources -f -
+
 deploy-monitoring: get-cluster-credentials
 	$(MAKE) -C ./cluster/monitoring apply