Also copy c-m chart to non-v-prefixed tag

[SgtCoDFish]

This helps with helm upgrade use!

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign jakexks for approval. For more information see the Code Review Process.

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

Details

Needs approval from an approver in each of these files:

• OWNERS

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

Adds a second OCI tag for the cert-manager Helm chart without the leading v (e.g., 1.14.0 in addition to v1.14.0) to make helm upgrade flows easier when version resolution expects non-v semver tags.

Changes:

• Derive a non-v version string from RELEASE_VERSION and copy the chart OCI artifact to that tag.
• Sign the newly created non-v tag with cosign (matching the existing signing flow for the v tag).

---

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

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

---

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

[Copilot]

The indentation here uses a tab character, which is inconsistent with the rest of this script. The script uses 2-space indentation throughout (see lines 39-40, 44-45, 76-77). Please change the tab to 2 spaces to maintain consistency.