CI: linux-i386 failed but green

[jangko]

[Suite] RocksStoreRef
Segmentation fault (core dumped)
stack trace: (most recent call last)
/home/runner/work/nimbus-eth1/nimbus-eth1/vendor/nimbus-build-system/vendor/Nim/lib/system/nimscript.nim(416, 18)
/home/runner/work/nimbus-eth1/nimbus-eth1/nimbus.nimble(62, 8) test_rocksdbTask
/home/runner/work/nimbus-eth1/nimbus-eth1/nimbus.nimble(56, 8) test
/home/runner/work/nimbus-eth1/nimbus-eth1/vendor/nimbus-build-system/vendor/Nim/lib/system/nimscript.nim(260, 7) exec
/home/runner/work/nimbus-eth1/nimbus-eth1/vendor/nimbus-build-system/vendor/Nim/lib/system/nimscript.nim(260, 7) Error: unhandled exception: FAILED: ulimit -s 750 && build/test_kvstore_rocksdb [OSError]
Makefile:135: recipe for target 'test' failed
make: *** [test] Error 1

https://github.com/status-im/nimbus-eth1/runs/5969812471?check_suite_focus=true

https://github.com/status-im/nimbus-eth1/runs/5969971257?check_suite_focus=true

[kdeme]

This is not an issue and done on purpose: https://github.com/status-im/nimbus-eth1/blob/master/.github/workflows/ci.yml#L289

In order to avoid blocking PRs on this failure, but at the same time not completely removing the tests for i386.
afaik it is not possible to let them fail and let Github Actions ignore them.