containerd base_runtime_spec for FPGA region programming

[mythi]

I was reading about base_runtime_spec and it looks it can be used to bring FPGA region programming to containerd. While we may want something DRA based in the future, this could be an option to fill the gap today as no new development is needed:

$ cat /etc/fpga.json |jq .hooks
{
  "createRuntime": [
    {
      "path": "/usr/local/fpga-sw/intel-fpga-crihook"
    }
  ]
}

containerd config.toml will have a runtime handler entry with base_runtime_spec = "/etc/fpga.json" .

[mythi]

replaced by #1457