feat(argo-rollouts): Support extraArgs for controller and dashboard (#978)

* feat(argo-rollouts): Support extraArgs for controller and dashboard

Adding support for additional arguments that are passed to the controller and the dashboard.
Following the pattern of other Argo charts by re-using the name `extraArgs` for the value.

Refs: https://github.com/argoproj/argo-helm/issues/969
Signed-off-by: Sebastian J <zeeman@zeeman.de>

* Update charts/argo-rollouts/templates/controller/deployment.yaml

Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>
Signed-off-by: Sebastian J <zeeman@zeeman.de>

* Update charts/argo-rollouts/templates/dashboard/deployment.yaml

Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>
Signed-off-by: Sebastian J <zeeman@zeeman.de>

* PR comments

Signed-off-by: Sebastian J <zeeman@zeeman.de>

* Fix newly added parameters in README

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

* Fix changelog keyword

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

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

charts/argo-rollouts/templates/controller/deployment.yaml

@@ -32,10 +32,13 @@ spec:
       serviceAccountName: {{ include "argo-rollouts.serviceAccountName" . }}
       containers:
       - image: "{{ .Values.controller.image.registry }}/{{ .Values.controller.image.repository }}:{{ default .Chart.AppVersion .Values.controller.image.tag }}"
-        {{- if not .Values.clusterInstall }}
         args:
+        {{- if not .Values.clusterInstall }}
         - --namespaced
         {{- end }}
+        {{- with .Values.controller.extraArgs }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
         imagePullPolicy: {{ .Values.controller.image.pullPolicy }}
         name: argo-rollouts
         ports: