docs: add more detail about reviewing image promotion PR

Author: jackfrancis

docs/book/src/developers/development.md

@@ -522,7 +522,7 @@ With the following environment variables defined, you can build a CAPZ cluster f
 | Environment Variable | Value  |
 |----------------------|--------|
 | `E2E_ARGS`           | `-kubetest.use-ci-artifacts` |
-| `KUBERNETES_VERSION` | `latest` - extract Kubernetes version from https://dl.k8s.io/ci/latest.txt (main's HEAD)<br>`latest-1.21` - extract Kubernetes version from https://dl.k8s.io/ci/latest-1.21.txt (release branch's HEAD) |
+| `KUBERNETES_VERSION` | `latest` - extract Kubernetes version from https://dl.k8s.io/ci/latest.txt (main's HEAD)<br>`latest-1.25` - extract Kubernetes version from https://dl.k8s.io/ci/latest-1.25.txt (release branch's HEAD) |
 | `WINDOWS_FLAVOR`     | Optional, can be `containerd` or `containerd-2022`, when not specified dockershim is used |
 | `KUBETEST_WINDOWS_CONFIG`     | Optional, can be `upstream-windows-serial-slow.yaml`, when not specified `upstream-windows.yaml` is used |
 | `WINDOWS_CONTAINERD_URL`     | Optional, can be any url to a `tar.gz` file containing binaries for containerd in the same format as upstream package |

docs/book/src/developers/releasing.md

@@ -89,13 +89,19 @@ This will automatically trigger a [Github Action](https://github.com/kubernetes-
 
 ### Promote image to prod repo
 
-- Images are built by the [post push images job](https://testgrid.k8s.io/sig-cluster-lifecycle-cluster-api-provider-azure#post-cluster-api-provider-azure-push-images). This will push the image to a [staging repository](https://console.cloud.google.com/gcr/images/k8s-staging-cluster-api-azure/GLOBAL/cluster-api-azure-controller?rImageListsize=30).
+- Images are built by the [post push images job](https://testgrid.k8s.io/sig-cluster-lifecycle-cluster-api-provider-azure#post-cluster-api-provider-azure-push-images). This will push the image to a [staging repository][staging-repository].
 - If you don't have a GitHub token, create one by going to your GitHub settings, in [Personal access tokens](https://github.com/settings/tokens). Make sure you give the token the `repo` scope.
 - Wait for the above job to complete for the tag commit and for the image to exist in the staging directory, then create a PR to promote the image and tag:
   - `export GITHUB_TOKEN=<your GH token>`
   - `make promote-images`
 
-This will automatically create a PR in [k8s.io](https://github.com/kubernetes/k8s.io) and assign the CAPZ maintainers. Example PR: https://github.com/kubernetes/k8s.io/pull/3007.
+This will automatically create a PR in [k8s.io](https://github.com/kubernetes/k8s.io) and assign the CAPZ maintainers. Example PR: https://github.com/kubernetes/k8s.io/pull/4284.
+
+For reviewers of the above-created PR, to confirm that the resultant image SHA-to-tag addition is valid, you can check against the [staging repository][staging-repository].
+
+Using [the above example PR](https://github.com/kubernetes/k8s.io/pull/4284), to verify that the image identified by SHA `d0636fad7f4ced58b5385615a53b7cb2053f79c4788bd299e0ac9e46a25b5053` has the expected `v1.4.3`, tag, you would inspect the image metadata by viewing it in the Google Container Registry UI:
+
+- https://console.cloud.google.com/gcr/images/k8s-staging-cluster-api-azure/global/cluster-api-azure-controller@sha256:d0636fad7f4ced58b5385615a53b7cb2053f79c4788bd299e0ac9e46a25b5053
 
 ### Release in GitHub
 
@@ -144,3 +150,4 @@ Here is a reference PR that applied the required test job changes following the
 [semver]: https://semver.org/#semantic-versioning-200
 [template]: /docs/release-notes-template.md
 [versioning]: #versioning
+[staging-repository]: https://console.cloud.google.com/gcr/images/k8s-staging-cluster-api-azure/GLOBAL/cluster-api-azure-controller?rImageListsize=30