At this date, the CI pipelines for tests currently fail:
/usr/bin/curl -fsSL https://www.sbl-site.org/Fonts/SBL_Hbrw.ttf -o .fonts/SBL_Hbrw.ttf
curl: (22) The requested URL returned error: 404
This has notably been seen in PR #2294 and #2278 - esp. for the latter, impending further work on it.
I think the "new "URL for this font is now: https://www.sbl-site.org/wp-content/themes/basket/fonts/bib-fonts/SBL_Hbrw.ttf
Do these folks have a proper/stable way to distribute that font? Can we question why SILE's CI and tests may be using such a "weird" font, while there might be more stable alternatives, distributed in a more stable wyay?