ci: store artifacts with logs in freebsd workflows

This change adds facility to store artifacts with logs after workflow
failures to FreeBSD workflows. The ChristopherHX/github-act-runner known
limitation

    You won't be able to run steps after a failure without using
    continue-on-error: true

is not relevant anymore [1]. So we can add steps with storing artifacts.

[1] https://github.com/ChristopherHX/github-act-runner/tree/58ae37abc6c2244d91822b8ba536aa0a8b829632#known-limitations

NO_DOC=ci
NO_CHANGELOG=ci
NO_TEST=ci