fix(argo-rollouts): Add subscriptions into notifcations-configmap (#2793)

* fix(argo-rollouts): Add subscriptions into notifcations-configmap

Signed-off-by: Jaime Pérez Halcón <jphalcon@gmail.com>

* fix(argo-rollouts): Set version

Signed-off-by: Jaime Pérez Halcón <jphalcon@gmail.com>

* fix(argo-rollouts): Updated readme

Signed-off-by: Jaime Pérez Halcón <jphalcon@gmail.com>

* fix(values.yaml): fixed trailing spaces

Signed-off-by: Jaime Pérez Halcón <jphalcon@gmail.com>

---------

Signed-off-by: Jaime Pérez Halcón <jphalcon@gmail.com>
Co-authored-by: Aikawa <yu.croco@gmail.com>

charts/argo-rollouts/values.yaml

@@ -479,3 +479,11 @@ notifications:
     # trigger.on-purple: |
     #   - send: [my-purple-template]
     #     when: rollout.spec.template.spec.containers[0].image == 'argoproj/rollouts-demo:purple'
+
+  # -- The subscriptions define the subscriptions to the triggers in a general way for all rollouts
+  subscriptions: {}
+    # subscriptions:
+    #   recipients:
+    #     - slack:<channel>
+    #   triggers:
+    #     - on-rollout-completed