Images: Bump Alpine to v3.23.0.

[Gacko]

/triage accepted
/kind cleanup
/priority backlog
/cc @cpanato @strongjz @tao12345666333

[netlify]

❌ Deploy Preview for kubernetes-ingress-nginx failed. Why did it fail? →

Name	Link
🔨 Latest commit	87975d2
🔍 Latest deploy log	https://app.netlify.com/projects/kubernetes-ingress-nginx/deploys/6933e06987236b0008a86f2f

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gacko

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [Gacko]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[Copilot]

Pull request overview

This pull request bumps the Alpine Linux base image version from 3.22.2 to 3.23.0 across all Dockerfiles and configuration files in the ingress-nginx project. This is a routine maintenance update to keep the base images current with the latest stable Alpine release.

• Updated all direct Alpine image references from alpine:3.22.2 to alpine:3.23.0
• Updated all Golang Alpine variant references from alpine3.22 to alpine3.23
• Updated example/documentation files to reflect the new version

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/e2e-image/Dockerfile	Updated base Alpine image to 3.23.0 for E2E test image
rootfs/Dockerfile-chroot	Updated base Alpine image to 3.23.0 for chroot environment
images/test-runner/rootfs/Dockerfile	Updated Golang Alpine variant to alpine3.23
images/nginx/rootfs/Dockerfile	Updated both builder and runtime Alpine images to 3.23.0
images/go-grpc-greeter-server/rootfs/Dockerfile	Updated Golang Alpine variant to alpine3.23 for build stage
images/fastcgi-helloserver/rootfs/Dockerfile	Updated Golang Alpine variant to alpine3.23 for builder
images/ext-auth-example-authsvc/rootfs/Dockerfile	Updated Golang Alpine variant to alpine3.23 for builder
images/custom-error-pages/rootfs/Dockerfile	Updated Golang Alpine variant to alpine3.23 for builder
images/cfssl/rootfs/Dockerfile	Updated base Alpine image to 3.23.0
docs/examples/customization/sysctl/patch.json	Updated Alpine image reference in example configuration to 3.23.0
Makefile	Updated E2E_IMAGE Golang Alpine variant to alpine3.23

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Gacko]

Requires this to be merged first, since there is no Go v1.25.4 image based on Alpine v3.23.0, but only a Go v1.25.5 one.