Document expected accession of fullyjustified.net

[colindean]

I've been using tectonic for few years and just now encountered an unexpected error:

[…]
warning: texput.tex:1108: Missing character: There is no ���� (U+1F6A7) in font [lmroman10-regular]:mapping=tex-text;!
warning: could not represent character "🚧" (0x1f6a7) in font "[lmroman10-regular]:mapping=tex-text;"
warning: failure requesting "SHA256SUM" from network
caused by: unexpected HTTP response code 403 Forbidden for URL https://data1.fullyjustified.net/tlextras-2022.0r0.tar
warning: failure requesting "SHA256SUM" from network
caused by: unexpected HTTP response code 403 Forbidden for URL https://data1.fullyjustified.net/tlextras-2022.0r0.tar
warning: failure requesting "SHA256SUM" from network
caused by: unexpected HTTP response code 403 Forbidden for URL https://data1.fullyjustified.net/tlextras-2022.0r0.tar
warning: failure requesting "SHA256SUM" from network
caused by: unexpected HTTP response code 403 Forbidden for URL https://data1.fullyjustified.net/tlextras-2022.0r0.tar
warning: open of input lmmono8-regular failed
caused by: unexpected HTTP response code 403 Forbidden for URL https://relay.fullyjustified.net/default_bundle_v33.tar
error: texput.tex:1161: Font TU/lmtt/m/n/8=[lmmono8-regular]: at 8.0pt not loadable: Metric (TFM) file or installed font not found
error: halted on potentially-recoverable error as specified
Error producing PDF.
note: reading from standard input; outputs will appear under the base name "texput"
note: Running TeX ...
note: downloading SHA256SUM
note: connecting to https://relay.fullyjustified.net/default_bundle_v33.tar

I couldn't find anything on the tectonic website about fullyjustified.net and that domain bare just redirects to the tectonic website… so clearly it's a project resource!

Looking around, I found that fullyjustified.net appears in the source in a few places - it's where tectonic gets its packages. OK, that makes perfect sense.

When I access those URLs in the error message directly with a browser, I can see that my corporate firewall is blocking the domain. It's been a while since I worked on the document I'm working on today and I'm aware of a more aggressive firewall policy lately, so it's unsurprising that I'd not encountered this until now.

What I'd expect is some kind of something — documentation somewhere — saying that tectonic may connect to this domain. I'm fully aware of tectonic retrieving packages on demand, but I thought they came from CTAN or something else with a more recognizably safe domain.