Testing needed for lzip substitutes!

[Ludovic Courtès]

Hello Guix!

I’ve set up ‘guix publish’ with both gzip and lzip substitutes at
<https://qualif.ci.guix.gnu.org>, in a setting similar to what we’ll
eventually deploy on ci.guix.gnu.org if everything goes well (there’s no
proper TLS certificate but it doesn’t matter for ‘guix substitute’).

Please try to fetch substitutes from there:

  --substitute-urls=https://qualif.ci.guix.gnu.org

If you’re running an “old” guix-daemon, you should be getting gzipped
substitutes; otherwise you should be getting lzipped substitutes (check
the URLs for /gzip or /lzip.)

Note that initially many substitutes will be missing because they need
to be “baked”; when that happens, be patient, and try again 5mn later.

‘guix publish’ is running with “-C gzip:5 -C lzip:9” mostly to save CPU
time, so don’t use it as an lzip vs. gzip benchmark.

Thanks,
Ludo’.