Detect new Virtualization framework under macOS (#801)

Check com.docker.virtualization process name in .docker_for_mac? for new Virtualization framework

lib/docker-sync/dependencies/docker_driver.rb

@@ -5,7 +5,11 @@ module Driver
         def self.docker_for_mac?
           return false unless Environment.mac?
           return @docker_for_mac if defined? @docker_for_mac
-          @docker_for_mac = Environment.system('pgrep -q com.docker.hyperkit')
+
+          # com.docker.hyperkit for old virtualization engine
+          # com.docker.virtualization for new virtualization engine
+          # see https://docs.docker.com/desktop/mac/#enable-the-new-apple-virtualization-framework
+          @docker_for_mac = Environment.system('pgrep -q com.docker.hyperkit') || Environment.system('pgrep -q com.docker.virtualization')
         end
 
         def self.docker_toolbox?

spec/lib/docker-sync/dependencies/docker_driver_spec.rb

@@ -25,6 +25,15 @@
       expect(DockerSync::Environment).to have_received(:system).with('pgrep -q com.docker.hyperkit')
     end
 
+    it 'checks if Docker is running in Virtualization' do
+      allow(DockerSync::Environment).to receive(:system).with('pgrep -q com.docker.hyperkit').and_return(false)
+      allow(DockerSync::Environment).to receive(:system).with('pgrep -q com.docker.virtualization').and_return(true)
+
+      is_expected.to be true
+      expect(DockerSync::Environment).to have_received(:system).with('pgrep -q com.docker.hyperkit')
+      expect(DockerSync::Environment).to have_received(:system).with('pgrep -q com.docker.virtualization')
+    end
+
     it 'is memoized' do
       expect { 1.times { described_class.docker_for_mac? } }.to change { described_class.instance_variable_defined?(:@docker_for_mac) }