Create BuildBuddy gRPC client

[mvgijssel]

ref #275

TODO:

• Call from GitHub actions
• Print logs nicely
• Call proper workflow (instead of test everything)

[mvgijssel]

Using trick from here bazelbuild/rules_docker#2149 (comment) to make the rules_docker and rules_proto_grpc play nice.

[mvgijssel]

Use https://grpc.io/docs/languages/python/basics/ to properly instantiate the client

[mvgijssel]

Install and require the grpcio library as mentioned here https://grpc.io/docs/languages/python/quickstart/ to get the “google.rpc” package? Or maybe ”protobuf” package?

[mvgijssel]

https://gist.github.com/luc-lynx/6d0fbf16c587bafeffeb15a34186d320 To make it work with authentication?

[mvgijssel]

Calling the script can use Bazel run —config buildbuddy_rbe … inside of GitHub? To speed up execution?