add support for s390x

[Zxilly]

The runner has an s390x branch under development that allows users to run custom runners on this architecture, so I am requesting to add support for this architecture.
This is mainly to add some new enums.

[gabriel-samfira]

Hi @Zxilly

My apologies for the late reply. We can add x390x as soon as the gh API returns tools download links for it. Currently it only returns the following:

[
  {
    "os": "osx",
    "architecture": "x64",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-osx-x64-2.321.0.tar.gz",
    "filename": "actions-runner-osx-x64-2.321.0.tar.gz",
    "sha256_checksum": "b2c91416b3e4d579ae69fc2c381fc50dbda13f1b3fcc283187e2c75d1b173072"
  },
  {
    "os": "osx",
    "architecture": "arm64",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-osx-arm64-2.321.0.tar.gz",
    "filename": "actions-runner-osx-arm64-2.321.0.tar.gz",
    "sha256_checksum": "fbee07e42a134645d4f04f8146b0a3d0b3c948f0d6b2b9fa61f4318c1192ff79"
  },
  {
    "os": "linux",
    "architecture": "x64",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-linux-x64-2.321.0.tar.gz",
    "filename": "actions-runner-linux-x64-2.321.0.tar.gz",
    "sha256_checksum": "ba46ba7ce3a4d7236b16fbe44419fb453bc08f866b24f04d549ec89f1722a29e"
  },
  {
    "os": "win",
    "architecture": "x64",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-win-x64-2.321.0.zip",
    "filename": "actions-runner-win-x64-2.321.0.zip",
    "sha256_checksum": "88d754da46f4053aec9007d172020c1b75ab2e2049c08aef759b643316580bbc"
  },
  {
    "os": "linux",
    "architecture": "arm",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-linux-arm-2.321.0.tar.gz",
    "filename": "actions-runner-linux-arm-2.321.0.tar.gz",
    "sha256_checksum": "2b96a4991ebf2b2076908a527a1a13db590217f9375267b5dd95f0300dde432b"
  },
  {
    "os": "linux",
    "architecture": "arm64",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-linux-arm64-2.321.0.tar.gz",
    "filename": "actions-runner-linux-arm64-2.321.0.tar.gz",
    "sha256_checksum": "62cc5735d63057d8d07441507c3d6974e90c1854bdb33e9c8b26c0da086336e1"
  },
  {
    "os": "win",
    "architecture": "arm64",
    "download_url": "https://github.com/actions/runner/releases/download/v2.321.0/actions-runner-win-arm64-2.321.0.zip",
    "filename": "actions-runner-win-arm64-2.321.0.zip",
    "sha256_checksum": "22df5a32a65a55e43dab38a200d4f72be0f9f5ce1839f5ad34e689a0d3ff0fb7"
  }
]