feat(argo-cd): Add support for extension (#1050)

* add support for extension

Signed-off-by: Qing Ye <ye.qing@gojek.com>

* add volume mounts

Signed-off-by: Qing Ye <ye.qing@gojek.com>

* add RBAC

Signed-off-by: Qing Ye <ye.qing@gojek.com>

* add more control to extensions values and update readme

Signed-off-by: Qing Ye <ye.qing@gojek.com>

* remove trailing spaces in values file

Signed-off-by: Qing Ye <ye.qing@gojek.com>

* add missing extensions.enabled

Signed-off-by: Qing Ye <ye.qing@gojek.com>

* Update charts/argo-cd/Chart.yaml

Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>
Signed-off-by: Qing Ye <ye.qing@gojek.com>

* add comment to extensions values

Signed-off-by: Qing Ye <ye.qing@gojek.com>

Co-authored-by: Qing Ye <ye.qing@gojek.com>
Co-authored-by: Marko Bevc <marko@scalefactory.com>
Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argo-cd/values.yaml

@@ -1276,6 +1276,24 @@ server:
   #    name: custom-tools
   #    subPath: helm
 
+  extensions:
+    # -- Enable support for extensions
+    ## This function in tech preview stage, do expect unstability or breaking changes in newer versions. Bump image.tag if necessary.
+    enabled: false
+
+    image:
+      # -- Repository to use for extensions image
+      repository: "ghcr.io/argoproj-labs/argocd-extensions"
+      # -- Tag to use for extensions image
+      tag: "v0.1.0"
+      # -- Image pull policy for extensions
+      imagePullPolicy: IfNotPresent
+
+    # -- Extensions to be loaded into the server
+    contents: []
+    # - name: argo-rollouts
+    #   url: https://github.com/argoproj-labs/rollout-extension/releases/download/v0.1.0/extension.tar
+
 ## Repo Server
 repoServer:
   # -- Repo server name