platform.os in manifest list are platform informations and the strings are produced by
platform library of python enables us to get platform information but the name format is different from runtime package of golang.
e.g.) OS: ubuntu, Architecture: x86-64
- runtime.Architecture: 'amd64'
- runtime.GOOS: 'linux'
- platform.machine(): 'x86_64'
- platform.system(): 'Linux'
Probably mapping of strings is necessary to support several architectures.