ci: Always set disks as non root disks (#14389)

In the testing mode, reformatting disks will fail because the healing
code will complain if one disk is in root mode. This commit will
automatically set all disks as non-root if MINIO_CI_CD is set.

cmd/xl-storage.go

@@ -212,6 +212,7 @@ func newXLStorage(ep Endpoint) (s *xlStorage, err error) {
 	}
 
 	var rootDisk bool
+	if !globalIsCICD {
 		if globalRootDiskThreshold > 0 {
 			// Use MINIO_ROOTDISK_THRESHOLD_SIZE to figure out if
 			// this disk is a root disk.
@@ -229,6 +230,7 @@ func newXLStorage(ep Endpoint) (s *xlStorage, err error) {
 				return nil, err
 			}
 		}
+	}
 
 	s = &xlStorage{
 		diskPath:   path,