Add Config to service options (#1336)

Co-authored-by: Ben Toogood <ben@micro.mu>
Co-authored-by: Asim Aslam <asim@aslam.me>

options.go

@@ -9,6 +9,7 @@ import (
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/client/selector"
+	"github.com/micro/go-micro/v2/config"
 	"github.com/micro/go-micro/v2/config/cmd"
 	"github.com/micro/go-micro/v2/debug/profile"
 	"github.com/micro/go-micro/v2/debug/trace"
@@ -27,6 +28,7 @@ type Options struct {
 	Registry  registry.Registry
 	Transport transport.Transport
 	Profile   profile.Profile
+	Config    config.Config
 
 	// Before and After funcs
 	BeforeStart []func() error
@@ -46,6 +48,7 @@ func newOptions(opts ...Option) Options {
 		Auth:      auth.DefaultAuth,
 		Broker:    broker.DefaultBroker,
 		Cmd:       cmd.DefaultCmd,
+		Config:    config.DefaultConfig,
 		Client:    client.DefaultClient,
 		Server:    server.DefaultServer,
 		Registry:  registry.DefaultRegistry,
@@ -143,6 +146,13 @@ func Auth(a auth.Auth) Option {
 	}
 }
 
+// Config sets the config for the service
+func Config(c config.Config) Option {
+	return func(o *Options) {
+		o.Config = c
+	}
+}
+
 // Selector sets the selector for the service client
 func Selector(s selector.Selector) Option {
 	return func(o *Options) {