Fix test_stm by using posix Eio backend (#2391)
* Fix test_stm by using posix Eio backend
The test_stm test was disabled because it exhausted io_uring resources
on Linux (ENOMEM on io_uring_queue_init when spawning multiple Eio
domains).
Instead of disabling the test, use the posix backend via EIO_BACKEND
environment variable. This requires converting the test stanza to an
executable + rule pattern to allow setting the environment variable.
a09814
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Jan 28 23:32 +00:00