Add Capability for Testing for gRPC on big endian systems

[yashykt]

Currently, the gRPC testing infrastructure does not have the capability to run tests on a big endian system. This means that we have no immediate way of knowing whether gRPC is working or not for big endian systems.

After talking to @nicolasnoble about it, it seems that Kokoro does not support integration with big endian systems.

Let's track possible solutions to provide testing on big endian systems here.

[vmorris]

Hello, I have been given access to one of the s390x systems that provides Golang with a build and test environment. This system will persist as a target for CI/CD.

Of particular interest is getting grpc/grpc-node#296 resolved, but we can build all grpc s390x binaries here.

Please let me know what I need to do to facilitate this further. Thanks!

[stale]

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