Hi,

Thanks for the wonderful readme/documentation, I could build opentelemetry-cpp from the source almost instantly, run the tests outlined successfully on architecture in the subject.

In case, if you are wondering what ppc64le, s390x architectures are?
ppc64le is a RISC Architecture and is IBM's prodigy, IBM has made its ISA (Instruction Set Architecture) open-source,
doing so they have contributed back to the opensource world. Many of the pioneers of banking, HPC industries today run on ppc64le architecture.

s390x (IBM Z) is a CISC architecture used in IBM and some other vendors' mainframe systems. Mainframe computers were established in the 1960s and continue to evolve retaining full backward compatibility. Nowadays they are used for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.

We are trying to enable this project and we have seen no/minimal deviation in build/test instructions.

I understand GH Actions is used as CI/CD, for a ppc64le/s390x we would like to propose TravisCI.