Resolve "Enable alpha plugins by default in ArgoCD"

General MR

Summary

Enabling argocd alpha plugins by default within BigBang since "alpha plugins" are included within image from PlatformOne/BigBang by default.

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/1267

chart/templates/argocd/values.yaml

@@ -77,6 +77,9 @@ redis-bb:
 server:
   image: 
     imagePullPolicy: {{ .Values.imagePullPolicy }}
+  config:
+    # Must be enabled for plugins included in PlatformOne image.
+    kustomize.buildOptions: "--enable-alpha-plugins"
 
 repoServer:
   image: