use region input to detect the Bucket region

Signed-off-by: Jalaja Ganapathy <jalaja@replicated.com>

Signed-off-by: Jalaja <jalaja@replicated.com>

changelogs/unreleased/3617-jala-dx

@@ -0,0 +1 @@
+Region is calculated incorrectly when gov account is used.

pkg/restic/config.go

@@ -64,10 +64,14 @@ func getRepoPrefix(location *velerov1api.BackupStorageLocation) (string, error)
 	switch backendType {
 	case AWSBackend:
 		var url string
+		var region string
 		switch {
 		// non-AWS, S3-compatible object store
 		case location.Spec.Config["s3Url"] != "":
 			url = location.Spec.Config["s3Url"]
+		case location.Spec.Config["region"] != "":
+			region = location.Spec.Config["region"]
+			url = fmt.Sprintf("s3-%s.amazonaws.com", region)
 		default:
 			region, err := getAWSBucketRegion(bucket)
 			if err != nil {