[feature] Publish centrifugo gRPC schema to Buf Schema Registry

[kop]

Nowadays, to start using Centrifugo gRPC API, we have to compile protobufs first.
This is a working solution, but this can be improved.

The Buf Schema Registry provides hosting for Protobuf/gRPC definitions, similar to how package managers work. The giant bonus of BSR is its support for automatic SDKs generation.

By publishing gRPC schemas to BSR, Centrifugo could provide a number of "include-and-use" gRPC SDKs for Go, JS, Rust, Python and other languages.

[FZambia]

Done in v5.4.3 - https://github.com/centrifugal/centrifugo/releases/tag/v5.4.3

Example for Go can be found in description of #863

@kop please check it out

[kop]

Thank you, @FZambia. I've successfully switched to SDK generated from BSR and everything seems to be running smooth.

One issue I noticed is that I was unable to use the latest version of protocolbuffers/go plugin (v1.34.2). Had to use v1.33.0 instead. The Go module BSR generates does not define the minimum Go version in go.mod, so Go defaults to v1.16. Which does not work because the generated code is using newer syntax available starting from v1.18.

However, this might be a problem with my setup. I have quite a Frankenstein project with dependencies on modules that use old gRPC-related libraries. Maybe this is the reason Go dependency resolution is not happy in my case.

[FZambia]

Maybe this is the reason Go dependency resolution is not happy in my case.

Maybe you can try on new project with empty dependencies?

[kop]

Yep. I can confirm, works fine on a project with empty dependencies.

[FZambia]

Cool! Closing then.