Update GRPC for consistency

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

containers/containers.go

@@ -1,7 +1,10 @@
 package containers
 
 import (
+	"bytes"
 	"context"
+	"encoding/gob"
+	"errors"
 	"time"
 )
 
@@ -13,13 +16,35 @@ type Container struct {
 	ID        string
 	Labels    map[string]string
 	Image     string
-	Runtime   string
+	Runtime   RuntimeInfo
 	Spec      []byte
 	RootFS    string
 	CreatedAt time.Time
 	UpdatedAt time.Time
 }
 
+type RuntimeInfo struct {
+	Name    string
+	Options map[string]string
+}
+
+func (r RuntimeInfo) MarshalBinary() ([]byte, error) {
+	buf := bytes.NewBuffer(nil)
+	if err := gob.NewEncoder(buf).Encode(r); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func (r RuntimeInfo) UnmarshalBinary(data []byte) error {
+	buf := data
+	if len(buf) == 0 {
+		return errors.New("RuntimeInfo: no data")
+	}
+	reader := bytes.NewReader(buf)
+	return gob.NewDecoder(reader).Decode(&r)
+}
+
 type Store interface {
 	Get(ctx context.Context, id string) (Container, error)
 	List(ctx context.Context, filter string) ([]Container, error)