design: Wasm extension supports OCI image code source

[zhaohuabing]

Related: https://github.com/envoyproxy/gateway/issues/3304

[zirain]

I'm not sure which is a better idea:

1. extend EG controller support this
2. introduce an new component.

[guydc]

Is there potential for a new component to be reused by other envoy control planes (e.g. istio)? If so, it could be beneficial from long-term maintenance perspective...

Can we implement this based on some existing OCI registry cache?

[zhaohuabing]

Is there potential for a new component to be reused by other envoy control planes (e.g. istio)? If so, it could be beneficial from long-term maintenance perspective...

To simplify the process, I'd like to create this component as part of EG rather than a standalone binary. This will help us avoid unnecessary dependencies/management(install, upgrade,etc.) overhead.

Can we implement this based on some existing OCI registry cache?

We can use https://github.com/google/go-containerregistry

[github-actions[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.97%. Comparing base (d5fde3e) to head (0ba441c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3313   +/-   ##
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  Coverage   68.97%   68.97%           
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  Files         176      176           
  Lines       21731    21731           
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  Hits        14989    14989           
  Misses       5662     5662           
  Partials     1080     1080           

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