Add generate-docs command to build task

The Swift Docc has to run in a Linux container to be able to build the
documentation, as it needs access to the inotify.h header files.

Sources/TaskCLI/Command.swift

@@ -4,6 +4,6 @@ import ArgumentParser
 struct Command: AsyncParsableCommand {
 	static let configuration = CommandConfiguration(
 		abstract: "Project tasks of Astzweig's Swift Inotify project.",
-		subcommands: [TestCommand.self]
+		subcommands: [TestCommand.self, GenerateDocumentationCommand.self]
 	)
 }