Pact Foundation

Hi folks, I saw an issue when trying to use protobuf plugin:
```builder.UsingPlugin(message.PluginConfig{
		Plugin: "protobuf",
})```
Curious if this looks familiar to anyone here:
```2023-05-02T01:01:36.348285Z DEBUG tokio-runtime-worker pact_plugin_driver::child_process: Plugin(protobuf, 59762, STDERR) || thread 'main' panicked at 'failed to create appender: Os { code: 1, kind: PermissionDenied, message: "Operation not permitted" }', /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/tracing-appender-0.2.2/src/rolling.rs:499:53```

I assume there are some permission issues when it tries to create tracing appender <https://github.com/tokio-rs/tracing/blob/388fff8371fef1ec0f75bc495fe1ad4cfa045f7b/tracing-appender/src/rolling.rs#L555-L569|here>.

I think this is file permissions. It is trying to create a log file in the plugin directory

Yeah seems like the case, I’ve checked that files are there tho and permissions look okay. Should `-rw-r--r--` be good for it?
```ls -l /Users/yu.xie/.pact/plugins/protobuf-0.3.0/log
total 0
-rw-r--r--  1 yu.xie  staff  0 May  1 17:48 plugin.log.2023-05-02
-rw-r--r--  1 yu.xie  staff  0 May  1 17:48 plugin.log.json.2023-05-02```

It's a log directory, so it should be safe to use `w` for all levels