Tasks to bump to Kubernetes v1.26

[sbueringer]

This issue is tracking the tasks that should be implemented after the Kubernetes minor release has been released.

Tasks

Prerequisites:

• Decide which Cluster API release series will support the new Kubernetes version
  • If feasible we usually cherry-pick the changes back to the latest release series.

Supporting managing and running on the new Kubernetes version

This section contains tasks to update our book, e2e testing and CI to use and test the new Kubernetes version
as well as changes to Cluster API that we might have to make to support the new Kubernetes version. All of these
changes should be cherry-picked to all release series that will support the new Kubernetes version.

• Modify quickstart and CAPD to use the new Kubernetes release:
  • Bump the Kubernetes version in:
    • test/*: search for occurrences of the previous Kubernetes version
    • Tiltfile
  • Ensure the latest available kind version is used as well.
  • Verify the quickstart manually
  • Prior art: ⚠️ Use Kubernetes 1.25 in Quick Start docs and CAPD. kubernetes-sigs/cluster-api#7156
• Job configurations:
  • For all releases which will support the new Kubernetes version:
    • Update INIT_WITH_KUBERNETES_VERSION.
    • Add new periodic upgrade jobs .
    • Adjust presubmit jobs so that we have the latest upgrade jobs available on PRs.
  • Prior art: Bump cluster-api jobs for v1.25/v1.26 kubernetes/test-infra#27421
• Update book:
  • Update supported versions in versions.md
  • Update job documentation in jobs.md
  • Prior art: 🌱 Update versions doc adding Kubernetes 1.25 kubernetes-sigs/cluster-api#7194 📖 docs update jobs.md kubernetes-sigs/cluster-api#7196
• Issues specific to the Kubernetes minor release:
  • Sometimes there are adjustments that we have to make in Cluster API to be able to support
    a new Kubernetes minor version. Please add these issues here when they are identified.

Using new Kubernetes dependencies

This section contains tasks to update Cluster API to use the latest Kubernetes Go dependencies and related topics
like using the right Go version and build images. These changes are only made on the main branch. We don't
need them in older releases as they are not necessary to manage workload clusters of the new Kubernetes version or
run the Cluster API controllers on the new Kubernetes version.

• Ensure there is a new controller-runtime minor release which uses the new Kubernetes Go dependencies.
• Update our Prow jobs for the main branch to use the correct kubekins-e2e image
  • It is recommended to have one PR for presubmit and one for periodic jobs to reduce the risk of breaking the periodic jobs.
  • Prior art: presubmit jobs: Upgrade cluster-api kubekins-e2e version (v20220829-d5650c79bf-1.24 -… kubernetes/test-infra#27311
  • Prior art: periodic jobs: Upgrade cluster-api kubekins-e2e version (v20220829-d5650c79bf-1.24 -… kubernetes/test-infra#27311
• Bump the Go version in Cluster API: (if Kubernetes is using a new Go minor version)
  • Search for the currently used Go version across the repository and update it
  • We have to at least modify it in: .github/workflows, hack/ensure-go.sh, .golangci.yml, cloudbuild*.yaml, go.mod, Makefile, netlify.toml, Tiltfile
  • Prior art: 🌱 Upgrade golang version (1.18.3 -> 1.19.0) kubernetes-sigs/cluster-api#7135
• Bump controller-runtime
• Bump controller-tools
• Bump the Kubernetes version used in integration tests via KUBEBUILDER_ENVTEST_KUBERNETES_VERSION in Makefile
  • Note: This PR should be cherry-picked as well. It is part of this section as it depends on kubebuilder/controller-runtime
    releases and is not strictly necessary for Supporting managing and running on the new Kubernetes version.
  • Prior art: 🌱 Update kubebuilder envtest (1.24.2 -> 1.25.0) kubernetes-sigs/cluster-api#7193
• Bump conversion-gen via CONVERSION_GEN_VER in Makefile
  • Prior art: 🌱 Update conversion-gen version (v0.23.1 -> v0.25.0) kubernetes-sigs/cluster-api#7118