Add support for ghe.com domain

[easyt]

This PR adds support for treating domains ending in ghe.com as hosted.

[TingluoHuang]

EndsWith("ghe.com" or EndsWith(".ghe.com"?

[TingluoHuang]

should we introduce an env to allow overwriting this behavior? for edge cases where the customer's GHES is on the same name.

[easyt]

Good point. I'll fix that.

[easyt]

Would GHES ever be on ghe.com?

[TingluoHuang]

You never know what customers will try to use in their network.

[TingluoHuang]

something like

var takeOverGhe = StringUtil.ConvertToBoolean(Environment.GetEnvironmentVariable("GITHUB_ACTIONS_RUNNER_TAKEOVER_GHE_DOTCOM"));
return string.Equals(gitHubUrl.Host, "github.com", StringComparison.OrdinalIgnoreCase) ||
                string.Equals(gitHubUrl.Host, "www.github.com", StringComparison.OrdinalIgnoreCase) ||
                string.Equals(gitHubUrl.Host, "github.localhost", StringComparison.OrdinalIgnoreCase) ||
                (!takeOverGhe && gitHubUrl.Host.EndsWith(".ghe.com", StringComparison.OrdinalIgnoreCase));

[TingluoHuang]

in case GHES customers for whatever reason used .ghe.com, they can export GITHUB_ACTIONS_RUNNER_TAKEOVER_GHE_DOTCOM=1 and make their things keep working.

[TingluoHuang]

Suggested change

	var forceGhes = StringUtil.ConvertToBoolean(Environment.GetEnvironmentVariable("GITHUB_ACTIONS_RUNNER_FORCE_GHES"));
	if (forceGhes)
	{
	return false;
	}
	return
	string.Equals(gitHubUrl.Host, "github.com", StringComparison.OrdinalIgnoreCase) ||
	if (StringUtil.ConvertToBoolean(Environment.GetEnvironmentVariable("GITHUB_ACTIONS_RUNNER_FORCE_GHES")))
	{
	return false;
	}
	return string.Equals(gitHubUrl.Host, "github.com", StringComparison.OrdinalIgnoreCase) ||

[mtodd]

Should there be an equivalent ghe.localhost check since we use that in github/github development?

[easyt]

That is a good point. I hadn't thought about local development. We can track keep tract of that and add it in. Thanks @mtodd!

cc @javs-perez