Close docker client (#789)

* Close docker client!

* Fix nil dereference

* Update run_context.go

* Bump

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/container/docker_run.go

@@ -76,6 +76,7 @@ type Container interface {
 	UpdateFromImageEnv(env *map[string]string) common.Executor
 	UpdateFromPath(env *map[string]string) common.Executor
 	Remove() common.Executor
+	Close() common.Executor
 }
 
 // NewContainer creates a reference to a container
@@ -246,6 +247,16 @@ func (cr *containerReference) connect() common.Executor {
 	}
 }
 
+func (cr *containerReference) Close() common.Executor {
+	return func(ctx context.Context) error {
+		if cr.cli != nil {
+			cr.cli.Close()
+			cr.cli = nil
+		}
+		return nil
+	}
+}
+
 func (cr *containerReference) find() common.Executor {
 	return func(ctx context.Context) error {
 		if cr.id != "" {