feat(argo-cd ingress): support google managed certificates for gce ingress (#1088)

* Add support for Google ManagedCertificates

Signed-off-by: Robert Lindner <robert.lindner@delivion.de>

* Add support for Google FrontendConfigs

I.e. for adding a http to https redirect on the load balancer.

Signed-off-by: Robert Lindner <robert.lindner@delivion.de>

* Apply changes from code review

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

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

charts/argo-cd/values.yaml

@@ -1233,6 +1233,27 @@ server:
   #      oauthclientCredentials:
   #        secretName: argocd-secret
 
+  ## Create a Google Managed Certificate for use with the GKE Ingress Controller
+  ## https://cloud.google.com/kubernetes-engine/docs/how-to/managed-certs
+  GKEmanagedCertificate:
+    # -- Enable ManagedCertificate custom resource for Google Kubernetes Engine.
+    enabled: false
+    # -- Domains for the Google Managed Certificate
+    domains:
+    - argocd.example.com
+
+  ## Create a Google FrontendConfig Custom Resource, for use with the GKE Ingress Controller
+  ## https://cloud.google.com/kubernetes-engine/docs/how-to/ingress-features#configuring_ingress_features_through_frontendconfig_parameters
+  GKEfrontendConfig:
+    # -- Enable FrontConfig custom resource for Google Kubernetes Engine
+    enabled: false
+    # -- [FrontendConfigSpec]
+    spec: {}
+  # spec:
+  #   redirectToHttps:
+  #     enabled: true
+  #     responseCodeName: RESPONSE_CODE
+
   # -- Additional containers to be added to the server pod
   ## See https://github.com/lemonldap-ng-controller/lemonldap-ng-controller as example.
   extraContainers: []