ci: Install specific protoc version when generating protobufs #3112
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This fixes the issue where CI is using a different version of
protoc
/protoc-gen-go
from our local environment. It downloads the specified version of the protobuf binary for the current system and verifies its hash. Current supported systems are macOS-aarch64 and linux-{x86_64,aarch64}. This is only used when we are regenerating the protobufs, so likely not something we will often run into.Now the generated pbs should be reproducible locally and on CI.