conformance test: ignore file type bits when comparing layers

When comparing layer payloads during conformance tests, mask off any
file type bits that the tar headers in the layers might have included.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

tests/conformance/conformance_test.go

@@ -9,6 +9,7 @@ import (
 	"flag"
 	"fmt"
 	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -789,7 +790,7 @@ func fsHeaderForEntry(hdr *tar.Header) FSHeader {
 		Name:     hdr.Name,
 		Linkname: hdr.Linkname,
 		Size:     hdr.Size,
-		Mode:     hdr.Mode,
+		Mode:     (hdr.Mode & int64(fs.ModePerm)),
 		UID:      hdr.Uid,
 		GID:      hdr.Gid,
 		ModTime:  hdr.ModTime,