Improve `regenerate.sh` to use the correct proto compiler version

[easwars]

Currently the regenerate script installs protoc-gen-go and protoc-gen-go-grpc in a workdir, but uses the system installed protoc which means that running the regenerate.sh script could result in all generated files being changed with a diff which would look something like:

@@ -20,7 +20,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 //     protoc-gen-go v1.31.0
-//     protoc        v4.22.0
+//     protoc        v3.21.2
 // source: grpc/lb/v1/load_balancer.proto

[avinilcodes]

I would like to contribute, can you please assign it to me

[dfawley]

@avinilcodes - Thanks!

Note that most people on our team use both linux and macOS, so the script should be able to handle this properly on both systems, or at least fall back to the old behavior gracefully.

[Clement-Jean]

Quick question: why not using the protoc binary from the fresh pull of protobuf repository? Wouldn't that solve the problem?

We could then use Make, CMake or Bazel to generate the binary and replace all the protoc refs to the bin folder of protobuf.

[dfawley]

We don't want to always use the latest version because that would require updates to our generated code frequently. We have a release document that includes updating other dependencies that should update this one as well. But we'd like it to be a static version for now.

[arvindbr8]

@avinilcodes -- friendly ping

[github-actions]

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