Longshot here, but anyone have a working example of a GitHub Action build that does Protobuf compilation (with prost), on a ubuntu image?

No matter what I do (I've tried both arduino/setup-protoc@v3 as well as installing it directly with a run target sudo apt-get update && sudo apt-get install -y protobuf-compiler) I end up with this compiler error:

  Error: Custom { kind: NotFound, error: "Could not find `protoc`. If `protoc` is installed, try setting the `PROTOC` environment variable to the path of the `protoc` binary. To install it on Debian, run `apt-get install protobuf-compiler`. It is also available at https://github.com/protocolbuffers/protobuf/releases  For more information: https://docs.rs/prost-build/#sourcing-protoc" }

(Yes, protoc gets installed by the build, PROTOC is set to the location where which protoc proves it's installed (/usr/bin/protoc), and it has execute permissions set as well.)

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