bug#70243: The substitute authorization warning is displayed when it shouldn't be

[Leo Famulari]

I just saw this on Debian:

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$ guix shell -D guix -- ./pre-inst-env guix weather linux-libre
computing 1 package derivations for x86_64-linux...
looking for 1 store items on https://ci.guix.gnu.org...
guix weather: warning: substitutes from 'https://ci.guix.gnu.org' are 
unauthorized
hint: To authorize all substitutes from `https://ci.guix.gnu.org' to be 
downloaded, the following command needs to be run as root:
[...]
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But, I do have the given key in my '/etc/guix/acl', and this works:

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guix shell -D guix -- ./pre-inst-env guix build linux-libre       
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0%
114.0 MB will be downloaded:
  /gnu/store/547y21y3w9nj29w9n73gp2arjxgmvvl6-linux-libre-6.8.2
substituting /gnu/store/547y21y3w9nj29w9n73gp2arjxgmvvl6-linux-libre-6.8.2...
[...]
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So, the warning is mistaken.

For your reference:

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guix shell -D guix -- ./pre-inst-env guix describe         
Git checkout:                                                  
  repository: /home/leo/work/guix/
  branch: master
  commit: 50a72a08af37557575199b56bbee9f334d58575a
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Let me know if there is any other information I can provide.