bug#55293: Guix gets stuck after substitute problem

[Jack Hill]

Hi Guix,

Sometimes my Guix commands get stuck after printing message like the 
following:

"""
guix substitute: warning: while fetching 
https://bordeaux.guix.gnu.org/nar/lzip/m6gaq582x4k0ajx9x7hznmw6a4dkg4m4-soundconverter-3.0.2:
 server is somewhat slow
guix substitute: warning: try `--no-substitutes' if the problem persists
warning: TLS non-fatal error: Resource temporarily unavailable, try again.
"""

By stuck, I mean that it doesn't seem to be making any progress, but also 
doesn't error and exit. Exiting is what I would expect if it encounters a 
problem from which it can't recover.

Best,
Jack