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>

cloudbuild.yaml

@@ -1,25 +1,14 @@
-# See https://cloud.google.com/cloud-build/docs/build-config
-
-timeout: 18000s
-options:
-  substitution_option: ALLOW_LOOSE
+substitutions:
+  _PULL_BASE_SHA: "12345"
 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
       - REPO_INFO=https://github.com/kubernetes/ingress-nginx
-      - COMMIT_SHA=$_PULL_BASE_SHA
-      - BUILD_ID=$BUILD_ID
-      - HOME=/root
-      - USER=root
+      - COMMIT_SHA=${_PULL_BASE_SHA}
+      - BUILD_ID=${BUILD_ID}
+    entrypoint: bash
     args:
-    - -c
-    - |
-      gcloud auth configure-docker \
-      && make release
-substitutions:
-  _GIT_TAG: "12345"
-  _PULL_BASE_REF: "main"
-  _PULL_BASE_SHA: '12345'
+      - -c
+      - gcloud auth configure-docker && make release
+timeout: 1800s