Merge pull request #7195 from uutils/sylvestre-patch-4

add two tests to the list of intermittent tests

Author: cakebaker

.github/workflows/ignore-intermittent.txt

@@ -1,3 +1,5 @@
 tests/tail/inotify-dir-recreate
 tests/timeout/timeout
 tests/rm/rm1
+tests/misc/stdbuf
+tests/misc/usage_vs_getopt