Cloud Build: Some chores. (#11757)

* Cloud Build: Remove comment.

* Cloud Build: Add newlines at EOF.

* Cloud Build: Align comment.

* Cloud Build: Remove trailing slash.

* Cloud Build: Remove quotes.

* Cloud Build: Align indentation.

* Cloud Build: Improve quotes.

* Cloud Build: Put arguments in one line.

* Cloud Build: Bump image.

* Cloud Build: Reorder entrypoint.

* Cloud Build: Adjust timeouts.

* Cloud Build: Remove useless files.

* Cloud Build: Remove `substitution_option`.

---------

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

images/kube-webhook-certgen/cloudbuild.yaml

@@ -1,32 +1,9 @@
-
-# Copyright 2021 The Kubernetes Authors. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-timeout: 10800s
-options:
-  substitution_option: ALLOW_LOOSE
 steps:
-  - name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20211118-2f2d816b90
-    entrypoint: bash
+  - name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20240523-a15ad90fc9
     env:
-      - DOCKER_CLI_EXPERIMENTAL=enabled
       - REGISTRY=gcr.io/k8s-staging-ingress-nginx
-      # default cloudbuild has HOME=/builder/home and docker buildx is in /root/.docker/cli-plugins/docker-buildx
-      # set the home to /root explicitly to if using docker buildx
-      - HOME=/root
+    entrypoint: bash
     args:
-    - -c
-    - |
-      gcloud auth configure-docker \
-      && cd images/ && make NAME=kube-webhook-certgen push
+      - -c
+      - gcloud auth configure-docker && cd images && make NAME=kube-webhook-certgen push
+timeout: 1800s