interfaces/builtin: add initial docker interface

interfaces/builtin/all.go

@@ -28,6 +28,7 @@ var allInterfaces = []interfaces.Interface{
 	&BluezInterface{},
 	&BrowserSupportInterface{},
 	&ContentInterface{},
+	&DockerInterface{},
 	&GpioInterface{},
 	&LocationControlInterface{},
 	&LocationObserveInterface{},

interfaces/builtin/all_test.go

@@ -35,6 +35,7 @@ func (s *AllSuite) TestInterfaces(c *C) {
 	c.Check(all, Contains, &builtin.BoolFileInterface{})
 	c.Check(all, Contains, &builtin.BluezInterface{})
 	c.Check(all, Contains, &builtin.BrowserSupportInterface{})
+	c.Check(all, Contains, &builtin.DockerInterface{})
 	c.Check(all, Contains, &builtin.GpioInterface{})
 	c.Check(all, Contains, &builtin.LocationControlInterface{})
 	c.Check(all, Contains, &builtin.LocationObserveInterface{})