[Feature Request] Add support for SSH deploy keys in pipelines chart

[juan-abia]

In my use case, I need to store an SSH deploy key (unable to use tokens) to access a private repository that hosts my Argo CD pipelines. I attempted to add a volume to the pipelines deployment to mount the SSH key, similar to how it's implemented in the openwebui chart, but found this functionality isn't currently available in the pipelines chart.

Feature request:

• Add support for mounting SSH deploy keys as volumes in the pipelines deployment
• Similar implementation to the existing openwebui chart functionality

Thank you for considering this feature request!