Create the backup repository only when it doesn't exist

When preparing a backup repository, Velero tries to connect to it, if fails then create it. The repository status always records the error reported by creation but the real reason maybe caused by the connect operation. This is confuseing and hard to debug

Signed-off-by: Wenkai Yin(尹文开) <yinw@vmware.com>

pkg/repository/provider/unified_repo.go

@@ -26,6 +26,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/kopia/kopia/repo"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 
@@ -188,11 +189,13 @@ func (urp *unifiedRepoProvider) PrepareRepo(ctx context.Context, param RepoParam
 		log.Debug("Repo has already been initialized remotely")
 		return nil
 	}
-	log.Infof("failed to connect to the repo: %v, will try to create it", err)
+	if !errors.Is(err, repo.ErrRepositoryNotInitialized) {
+		return errors.Wrap(err, "error to connect to backup repo")
+	}
 
 	err = urp.repoService.Init(ctx, *repoOption, true)
 	if err != nil {
-		return errors.Wrap(err, "error to init backup repo")
+		return errors.Wrap(err, "error to create backup repo")
 	}
 
 	log.Debug("Prepare repo complete")