add service account issuer migration doc

[elliotdobson]

Adds docs for non-disruptive migration of the Service Account Issuer in an existing cluster, as discovered in #16488.

In the future I will update this doc with the same procedure using the kOps official support from #16497, once I have tested it.

[linux-foundation-easycla]

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• ✅ login: elliotdobson / name: Elliot Dobson (8667279, cc9631c)

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[k8s-ci-robot]

Hi @elliotdobson. Thanks for your PR.

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[hakman]

/ok-to-test

[elliotdobson]

Having a look at the Netlify documentation preview I do not see the new page in the Operations side bar, but the Service Account Issuer (SAI) migration page exists. Do I need to add something?

[hakman]

Thank you @elliotdobson, I hope this will help many people in the future!
/lgtm
/approve

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[elliotdobson]

Having a look at the Netlify documentation preview I do not see the new page in the Operations side bar, but the Service Account Issuer (SAI) migration page exists. Do I need to add something?

Is this the same for you @hakman?

[hakman]

Having a look at the Netlify documentation preview I do not see the new page in the Operations side bar, but the Service Account Issuer (SAI) migration page exists. Do I need to add something?

Is this the same for you @hakman?

You are right, I will look into what's missing. Thanks!

[hakman]

@elliotdobson Could you add the doc to this list (in a new PR)?

kops/mkdocs.yml

Lines 74 to 98 in a4b9980

	- Operations:
	- Updates & Upgrades: "operations/updates_and_upgrades.md"
	- Rolling Updates: "operations/rolling-update.md"
	- Working with Instance Groups: "tutorial/working-with-instancegroups.md"
	- Using Manifests and Customizing: "manifests_and_customizing_via_api.md"
	- High Availability: "operations/high_availability.md"
	- Scaling: "operations/scaling.md"
	- Karpenter: "operations/karpenter.md"
	- Local asset repositories: "operations/asset-repository.md"
	- Instancegroup images: "operations/images.md"
	- Cluster configuration management: "changing_configuration.md"
	- Cluster Templating: "operations/cluster_template.md"
	- GPU setup: "gpu.md"
	- Label management: "labels.md"
	- Rotate Secrets: "operations/rotate-secrets.md"
	- Service Account Token Volume: "operations/service_account_token_volumes.md"
	- Moving from a Single Master to Multiple HA Masters: "single-to-multi-master.md"
	- Running kOps in a CI environment: "continuous_integration.md"
	- Gossip DNS: "gossip.md"
	- etcd:
	- etcd administration: "operations/etcd_administration.md"
	- etcd backup, restore and encryption: "operations/etcd_backup_restore_encryption.md"
	- Moving from a Single Master to Multiple HA Masters: "single-to-multi-master.md"
	- etcd3 Migration: "etcd3-migration.md"
	- Troubleshooting: "operations/troubleshoot.md"

[elliotdobson]

Done in #16573.