Merge pull request #5712 from coryb/docker-push-close-body

Fix missing Body.Close() calls on push to docker remote

remotes/docker/pusher.go

@@ -190,6 +190,7 @@ func (p dockerPusher) push(ctx context.Context, desc ocispec.Descriptor, ref str
 				return nil, err
 			}
 		}
+		defer resp.Body.Close()
 
 		switch resp.StatusCode {
 		case http.StatusOK, http.StatusAccepted, http.StatusNoContent:
@@ -382,6 +383,7 @@ func (pw *pushWriter) Commit(ctx context.Context, size int64, expected digest.Di
 	if resp.err != nil {
 		return resp.err
 	}
+	defer resp.Response.Body.Close()
 
 	// 201 is specified return status, some registries return
 	// 200, 202 or 204.