Is my ASP.NET core application running in Kubernetes (or Docker) ?

I came across a situation where I needed to change some logic in my ASP.NET core application dependant upon whether I was running inside Kubernetes or an Azure Web app, luckily there is an environment variable that we can use (and whilst we’re at it, there’s one for Docker as well)

var isHostedInKubernetes = 
   Environment.GetEnvironmentVariable("KUBERNETES_SERVICE_HOST") != null;
var isHostedInDocker = 
   Environment.GetEnvironmentVariable("DOTNET_RUNNING_IN_CONTAINER") == "true";