pg_waldump test failure

Hi,

I was looking at CI on postgres's github mirror and noticed this failure:
https://cirrus-ci.com/task/6719398406258688
https://api.cirrus-ci.com/v1/artifact/task/6719398406258688/testrun/build/testrun/pg_waldump/001_basic/log/regress_log_001_basic
https://api.cirrus-ci.com/v1/artifact/task/6719398406258688/testrun/build/testrun/pg_waldump/001_basic/log/001_basic_main.log

The specific failing test only has the following output:

[17:59:47.615](0.000s) not ok 66 - all output lines are FPW
[17:59:47.615](0.000s) # Failed test 'all output lines are FPW'
# at /Users/admin/pgsql/src/bin/pg_waldump/t/001_basic.pl line 294.
[17:59:47.615](0.000s) # got: '1'
# expected: '0'

Unfortunately that's not really enough information to debug why the test
failed, and since it doesn't seem to be a regularly occurring issue I can't
just add one-off debugging instrumentation.

It's possible that this is caused by an IPC::Run issue that was fixed by Noah,
but that hasn't yet been released and thus not been picked up by CI:
/messages/by-id/20250216235843.7c.nmisch@google.com

Even if it's that issue, I think this failure shows the test ought to be more
debuggable than it is. I guess the most basic thing would be to log
pg_waldump as a "note"?

Greetings,

Andres Freund