fix: ignore pax header files in chart validation

Signed-off-by: chloel <chloeleeq@gmail.com>
(cherry picked from commit 48704034a9)

pkg/chart/loader/archive.go

@@ -126,6 +126,12 @@ func LoadArchiveFiles(in io.Reader) ([]*BufferedFile, error) {
 			continue
 		}
 
+		switch hd.Typeflag {
+		// We don't want to process these extension header files.
+		case tar.TypeXGlobalHeader, tar.TypeXHeader:
+			continue
+		}
+
 		// Archive could contain \ if generated on Windows
 		delimiter := "/"
 		if strings.ContainsRune(hd.Name, '\\') {