Custom templates and Webhooks

[joaogl]

Summary

I think there should be a better way to specific the webhook used in a template, or rather, a template should not have a webhook defined in it. This should be more generic to be reusable.

Use Cases

Looking at this config I think highlights the issue even tho this example is quite simple, for bigger and larger templates it might become less easy to maintain.

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.discord-channel-1: |
    url: https://<hostname>/<optional-path>
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.discord-channel-2: |
    url: https://<hostname>/<optional-path>
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.app-deployed: |
    webhook:
      discord-channel-1:
        method: POST 
        body: |
          My super awesome message
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.app-deployed: |
    webhook:
      discord-channel-2:
        method: POST 
        body: |
          My super awesome message

This means, if I want to sent the same message, to 2 different channels, I simply have to duplicate the entire thing.
If I want to send it to 10 channels I have to duplicate 10 times the same thing.
If I then simply want to change the message, I have to change it 10 times because it's not generic.

For this case, I believe we should have to duplicate the service, since it's a different URL for each channel, but for the template we should be able to specify the same template to be used by any service essentially.

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