Add some intermittent tests to the list

example:
#10099 (comment)

Author: sylvestre

.github/workflows/ignore-intermittent.txt

@@ -2,6 +2,9 @@ tests/tail/inotify-dir-recreate
 tests/tail/overlay-headers
 tests/timeout/timeout
 tests/rm/rm1
+tests/shuf/shuf-reservoir
+tests/sort/sort-stale-thread-mem
+tests/tty/tty-eof
 tests/misc/stdbuf
 tests/misc/usage_vs_getopt
 tests/misc/tee