feat(argo-cd): Add support for external issuers in server Certificate resource (#1279)

* Add cert-manager issuer group support for external issuers

Signed-off-by: Greg Sidelinger <sidelig@nationwide.com>

* Bumping chart version and adding changelog

Signed-off-by: Greg Sidelinger <sidelig@nationwide.com>

* Fixing documentation.

Signed-off-by: Greg Sidelinger <sidelig@nationwide.com>

* Retrigger CI pipeline

Signed-off-by: Greg Sidelinger <sidelig@nationwide.com>

* Making server.certificate.issuer.group optional

Signed-off-by: Greg Sidelinger <sidelig@nationwide.com>

* Apply suggestions from code review

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Apply suggestions from code review

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

Co-authored-by: Greg Sidelinger <sidelig@nationwide.com>
Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argo-cd/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 appVersion: v2.3.4
 description: A Helm chart for Argo CD, a declarative, GitOps continuous delivery tool for Kubernetes.
 name: argo-cd
-version: 4.6.2
+version: 4.6.3
 home: https://github.com/argoproj/argo-helm
 icon: https://argo-cd.readthedocs.io/en/stable/assets/logo.png
 keywords:
@@ -21,4 +21,4 @@ dependencies:
     condition: redis-ha.enabled
 annotations:
   artifacthub.io/changes: |
-    - "[Changed]: Update Argo CD to v2.3.4"
+    - "[Added]: Add support for external issuers in server Certificate resource"