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Use curl instead of git

6 jobs for nix-ci in 10 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Prepare
failed #4160
common

00:00:10

 
  Build
skipped #4161
build_clang
skipped #4162
build_gcc
 
  Test
skipped #4163
test_doc
skipped #4164
test_unittest
skipped #4165
test_version_git
 
Name Stage Failure
failed
common Prepare There is an unknown failure, please try again
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.
HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.
ERROR: Job failed: exit code 1