refactor: decouple deploy and compose packages from client dependency

pkg/client/client.go

@@ -7,13 +7,12 @@ import (
 	"github.com/docker/cli/cli/streams"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"github.com/psviderski/uncloud/internal/machine/docker"
+	"github.com/psviderski/uncloud/pkg/api"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"
 	"os"
 )
 
-var ErrNotFound = errors.New("not found")
-
 // Client is a client for the machine API.
 type Client struct {
 	connector Connector
@@ -26,6 +25,8 @@ type Client struct {
 	Docker *docker.Client
 }
 
+var _ api.Client = (*Client)(nil)
+
 // Connector is an interface for establishing a connection to the machine API.
 type Connector interface {
 	Connect(ctx context.Context) (*grpc.ClientConn, error)