[Feature]: package as portable extension for CNPG

[jcpunk]

What problem does the new feature solve?

I use CNPG for most of my postgresql work in kubernetes. With postgresql18 CNPG supports adding a simple image containing an extension to be auto loaded.

Packaging the timescaledb extension in this manner would permit me to use my existing postgresql workflows with hypertables.

https://cloudnative-pg.io/documentation/current/imagevolume_extensions/

What does the feature do?

Rather than needing to maintain a custom image with my extension or adapt the existing official images, this would make adding timescaledb to my cluster a "3 line" change to my cluster deployment yaml.

Implementation challenges

I have no idea what the ABI symbol requirements are, how those are tracked, etc.

[mfreed]

Thanks for the recommendation @jcpunk.

We would welcome community contributors who regularly use CNPG to exploring creating such a packaging; we're not prioritizing third-party deployment frameworks for our own engineering work.