Add adcs-issuer (lcwsre) to external issuers list

[lcwsre]

What

Add lcwsre/adcs-issuer to the external issuers list.

Why

lcwsre/adcs-issuer is an enhanced fork of the existing nokia/adcs-issuer with significant improvements for enterprise ADCS environments:

• Custom Certificate Template Selection: Supports annotation-based ADCS template selection (cert-manager.io/cert-template) per Certificate/Ingress, allowing enterprises to use their own templates (WebServer, SubCA, custom server/client auth templates) instead of being hardcoded to BasicSSLWebServer.
• Kerberos (SPNEGO) Authentication: Full Kerberos support via gokrb5/v8 for domain-integrated environments, in addition to HTTP Basic Auth.
• Ingress Annotation Support: Resolves cert-manager.io/cert-template from Ingress annotations through the owner chain (Ingress → Certificate → CertificateRequest), so ingress-shim users don't need to create Certificate resources manually.
• Both Issuer and ClusterIssuer: Supports namespace-scoped AdcsIssuer and cluster-scoped ClusterAdcsIssuer.
• Helm Chart: Comprehensive Helm chart available at https://lcwsre.github.io/adcs-issuer/.
• Actively maintained: Regular releases, Go 1.26+, BSD-3-Clause license.

The existing adcs-issuer entry (djkormo) is kept as-is since it's a separate project.

Tier

🥈 (Maintained) — Released within 12 months, open source (BSD-3-Clause).

Changes

1. Added new table row for adcs-issuer (lcwsre) after the existing adcs-issuer entry
2. Added [config:adcs-issuer-lcwsre] reference link
3. Added [release:adcs-issuer-lcwsre] reference link

[cert-manager-prow]

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[lcwsre]

/test all

[cert-manager-prow]

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[lcwsre]

Hi @inteon, friendly ping on this PR.

This adds lcwsre/adcs-issuer as a new external issuer entry an enhanced fork of the existing nokia/adcs-issuer with:

• ADCS template selection via annotation
• Kerberos (SPNEGO) + Basic auth
• Ingress annotation propagation

The Netlify preview is ready and all automated checks pass. Would appreciate a review when you get a chance. Thanks!