Migrate Helm installations to OCI

[erikgb]

This PR migrates all (remaining) Helm installation/upgrade docs to use the OCI chart repositories.

Relates to cert-manager/community#43: To provide non-CyberArk employee maintainers full release capabilities, we have decided to migrate our official Helm installation method to the OCI chart repositories.

After this is merged, I will create additional PRs to update the release process documentation as agreed in our weekly development meeting.

[netlify]

✅ Deploy Preview for cert-manager ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	e9b83df
🔍 Latest deploy log	https://app.netlify.com/projects/cert-manager/deploys/6913beab7d81db0008013c94
😎 Deploy Preview	https://deploy-preview-1842--cert-manager.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[Copilot]

Pull Request Overview

This PR migrates Helm installation documentation from the legacy HTTP chart repository (https://charts.jetstack.io) to OCI-based chart repositories (oci://quay.io/jetstack/charts), enabling non-CyberArk maintainers to have full release capabilities.

Key Changes:

• Replace all jetstack/cert-manager chart references with oci://quay.io/jetstack/charts/cert-manager
• Remove helm repo add commands as they're not needed for OCI registries
• Add new documentation section explaining the legacy repository migration path

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
content/docs/usage/kube-csr.md	Update cert-manager installation to use OCI repository
content/docs/usage/istio-csr/installation.md	Migrate cert-manager and istio-csr Helm installations to OCI, remove repo add commands
content/docs/usage/gateway.md	Update cert-manager upgrade command to use OCI repository
content/docs/usage/csi-driver/installation.md	Migrate csi-driver installation to OCI, remove repo add command
content/docs/usage/csi-driver-spiffe/installation.md	Update cert-manager and csi-driver-spiffe installations to use OCI, remove repo add command
content/docs/usage/csi-driver-spiffe/README.md	Update csi-driver-spiffe installation example to use OCI repository
content/docs/tutorials/zerossl/zerossl.md	Update cert-manager installation to use OCI repository
content/docs/tutorials/getting-started-aws-letsencrypt/README.md	Migrate cert-manager installation to OCI, remove inline repo flag
content/docs/tutorials/getting-started-aks-letsencrypt/README.md	Update cert-manager install and upgrade commands to use OCI, remove repo add command
content/docs/tutorials/certificate-defaults/README.md	Migrate cert-manager installation to OCI, remove inline repo flag
content/docs/tutorials/acme/migrating-from-kube-lego.md	Update cert-manager upgrade command to use OCI repository
content/docs/trust/trust-manager/installation.md	Migrate cert-manager and trust-manager installations to OCI, remove repo add command
content/docs/trust/trust-manager/README.md	Update cert-manager and trust-manager installations to use OCI, remove repo add command
content/docs/troubleshooting/webhook.md	Migrate cert-manager installations to OCI, update hardcoded version to use variable
content/docs/policy/approval/approver-policy/installation.md	Migrate cert-manager and approver-policy installations to OCI, remove repo add command
content/docs/installation/upgrade.md	Add new section documenting legacy repository upgrade path, update primary upgrade commands to use OCI
content/docs/installation/compatibility.md	Update cert-manager installation to use OCI repository
content/docs/contributing/policy.md	Update Chart.yaml dependency example to use OCI repository
content/docs/configuration/acme/http01/README.md	Update cert-manager upgrade command to use OCI repository

---

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

[Copilot]

Pull Request Overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated no new comments.

---

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

[SgtCoDFish]

/lgtm
/approve

I haven't forensically looked to check that every reference is replaced, but this is a definite improvement as is and it looks thorough - thank you so much!

Will this allow us to close cert-manager/community#43 ?

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SgtCoDFish

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 [SgtCoDFish]

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

[erikgb]

Will this allow us to close cert-manager/community#43 ?

@SgtCoDFish, it will almost close the issue, but I want to update our release documentation before closing it.

[erikgb]

I haven't forensically looked to check that every reference is replaced, but this is a definite improvement as is and it looks thorough - thank you so much!

There is still a reference to the legacy Helm chart in the Flux tutorial. It required some more rewriting to be valid, so I decided to postpone it to a follow-up PR, which I will try to create shortly.