Add context field for notifications

[TomaszKrzeminskiMA]

Summary

Currently, only a limited number of fields can be used to template messages, which includes: rollout and recipient (https://argoproj.github.io/argo-rollouts/features/notifications/#templates). I would like to use the context feature to define shared variables (https://argocd-notifications.readthedocs.io/en/stable/templates/#defining-user-defined-context)

Use Cases

Define some shared context between all notification templates by setting a top-level YAML document of key-value pairs, which can then be used within templates.

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[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity.

[soar]

It's even strange, because in the docs there are a lot of mentions for context usage:

• https://argo-rollouts.readthedocs.io/en/latest/generated/notification-services/alertmanager/
• https://argo-rollouts.readthedocs.io/en/latest/generated/notification-services/github/

I even checked it twice, but it doesn't work.

[pshrm]

almost a year! still no progress.