Add Rake task for running Sorbet

Author: amomchilov

Rakefile

@@ -1,6 +1,19 @@
 # frozen_string_literal: true
 
 require "bundler/gem_tasks"
+
+desc "Type-check the code base with Sorbet"
+task :typecheck do
+  sh "bundle exec srb tc" do |ok, _res|
+    abort unless ok
+  end
+end
+
+# Aliases for common names for this task.
+task tc: :typecheck
+task srb: :typecheck
+task sorbet: :typecheck
+
 require "minitest/test_task"
 
 Minitest::TestTask.create do |t|
@@ -13,4 +26,4 @@ require "rubocop/rake_task"
 
 RuboCop::RakeTask.new
 
-task default: [:test, :rubocop]
+task default: [:typecheck, :test, :rubocop]