🚀 Feature

We have a Bazel+nix monorepo and are working on adopting grpc-gateway. Recently, the build team stiched over to using protoc toolchains with the protoc version from nix to avoid the continuous protobuf rebuilds we were experiencing with the native Bazel behavior.

Unfortunately, this broke our use of the protoc_gen_openapiv2 Bazel rule since that uses protoc directly rather than through a toolchain.

It would be super nice to be able to get protoc toolchain support for this rule.