Support other docker-compatible container engines (e.g. finch)

[georgearnall]

Somewhat related to #300. I see that there are some users that are using this package with different container runtimes (finch, podman etc).

There is a workaround for mapping these engines to the 'docker' binary with an alias, however this is not recommended by the maintainers of these projects.

It would be great if there was a way to override the binary that the library uses.

FluentDocker/Ductus.FluentDocker/Extensions/Utils/DockerBinariesResolver.cs

Lines 92 to 153 in 6cc2f4e

	private static IEnumerable<DockerBinary> ResolveFromPaths(SudoMechanism sudo, string password, params string[] paths)
	{
	var isWindows = IsWindows();
	if (null == paths || 0 == paths.Length)
	{
	var complete = new List<string>();
	var toolboxpath = Environment.GetEnvironmentVariable("DOCKER_TOOLBOX_INSTALL_PATH");
	var envpaths = Environment.GetEnvironmentVariable("PATH")?.Split(isWindows ? ';' : ':');
	if (null != envpaths)
	complete.AddRange(envpaths);
	if (null != toolboxpath)
	complete.Add(toolboxpath);
	paths = complete.ToArray();
	}
	if (null == paths)
	return new DockerBinary[0];
	var list = new List<DockerBinary>();
	foreach (var path in paths)
	{
	try
	{
	if (!Directory.Exists(path))
	{
	continue;
	}
	if (isWindows)
	{
	list.AddRange(from file in Directory.GetFiles(path, "docker*.*")
	let f = Path.GetFileName(file.ToLower())
	where null != f && (f.Equals("docker.exe") || f.Equals("docker-compose.exe") ||
	f.Equals("docker-machine.exe"))
	select new DockerBinary(path, f, sudo, password));
	var dockercli = Path.GetFullPath(Path.Combine(path, "..\\.."));
	if (File.Exists(Path.Combine(dockercli, "dockercli.exe")))
	{
	list.Add(new DockerBinary(dockercli, "dockercli.exe", sudo, password));
	}
	continue;
	}
	list.AddRange(from file in Directory.GetFiles(path, "docker*")
	let f = Path.GetFileName(file)
	let f2 = f.ToLower()
	where f2.Equals("docker") || f2.Equals("docker-compose") || f2.Equals("docker-machine")
	select new DockerBinary(path, f, sudo, password));
	}
	catch (Exception e)
	{
	// Illegal character in path if env variable PATH like this (spaces before ';'):
	// c:\folder1;c:\folder2;c:\folder3 ;
	Logger.Log("Failed to get docker binary from path: " + path + Environment.NewLine + e);
	}
	}
	return list;
	}