ci: don't install protoc

[djc]

@rami3l don't think we actually need it?

[rami3l]

@djc LGTM!

In that case maybe we should remove the description about protoc in https://rust-lang.github.io/rustup/dev-guide/tracing.html?highlight=protoc#opentelemetry-tracing as well? I remember having to install protoc locally to build the feature but that might have changed since then.

View changes since this review

[djc]

In that case maybe we should remove the description about protoc in https://rust-lang.github.io/rustup/dev-guide/tracing.html?highlight=protoc#opentelemetry-tracing as well? I remember having to install protoc locally to build the feature but that might have changed since then.

Removed that section.

[rami3l]

To double check: no trace of protobuf being implicitly installed on GitHub Actions, so looks safe to remove. Thanks again :)