feat: self-update of master and agents (#15)

internal/agent/updater/swarm.go

@@ -9,7 +9,6 @@ import (
 	"github.com/docker/docker/api/types/system"
 
 	"github.com/shcizo/package-updater/internal/imageref"
-	"github.com/shcizo/package-updater/internal/protocol"
 )
 
 // SwarmClient is the subset of the Docker SDK SwarmExecutor depends on.
@@ -40,7 +39,7 @@ func NewSwarmExecutor(cli SwarmClient, resolve *Resolver, auth *RegistryAuth) *S
 // the service that was inspected, so it changes exactly that object. Success
 // means the daemon accepted the new spec, not that the tasks have converged.
 // It returns the pinned ref.
-func (e *SwarmExecutor) Execute(ctx context.Context, job protocol.JobStart, out io.Writer) (string, error) {
+func (e *SwarmExecutor) Execute(ctx context.Context, job Job, out io.Writer) (string, error) {
 	info, err := e.cli.Info(ctx)
 	if err != nil {
 		return "", fmt.Errorf("docker info: %w", err)