modified for rich

dotnet-runtimeinfo.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <LangVersion>preview</LangVersion>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

</Project>

Program.cs

using System;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using static System.Console;

WriteLine("**.NET information");
WriteLine($"{nameof(Environment.Version)}: {Environment.Version}");
WriteLine($"{nameof(RuntimeInformation.FrameworkDescription)}: {RuntimeInformation.FrameworkDescription}");
WriteLine($"Libraries version: {((AssemblyInformationalVersionAttribute[])typeof(object).Assembly.GetCustomAttributes(typeof(AssemblyInformationalVersionAttribute),false))[0].InformationalVersion.Split('+')[0]}");
WriteLine($"Libraries hash: {((AssemblyInformationalVersionAttribute[])typeof(object).Assembly.GetCustomAttributes(typeof(AssemblyInformationalVersionAttribute), false))[0].InformationalVersion.Split('+')[1]}");
WriteLine();
WriteLine("**Environment information");
WriteLine($"{nameof(RuntimeInformation.OSDescription)}: {RuntimeInformation.OSDescription}");
WriteLine($"{nameof(Environment.OSVersion)}: {Environment.OSVersion}");
WriteLine($"{nameof(RuntimeInformation.OSArchitecture)}: {RuntimeInformation.OSArchitecture}");
WriteLine($"{nameof(Environment.ProcessorCount)}: {Environment.ProcessorCount}");
WriteLine();

if(RuntimeInformation.OSDescription.StartsWith("Linux") && Directory.Exists("/sys/fs/cgroup"))
{
    WriteLine("**CGroup info**");
    WriteLine($"cfs_quota_us: {System.IO.File.ReadAllLines("/sys/fs/cgroup/cpu/cpu.cfs_quota_us")[0]}");
    WriteLine($"memory.limit_in_bytes: {System.IO.File.ReadAllLines("/sys/fs/cgroup/memory/memory.limit_in_bytes")[0]}");
    WriteLine($"memory.usage_in_bytes: {System.IO.File.ReadAllLines("/sys/fs/cgroup/memory/memory.usage_in_bytes")[0]}");
}