fatal: transport 'file' not allowed

[eserte]

t/deploy/git.t fails on some systems like this:

# Git version: 2.030002
[2024-10-14 19:07:05.65804] [1247063] [warn] No files changed
[2024-10-14 19:07:05.78643] [1247063] [warn] No files changed
    # No tests run!

#   Failed test 'No tests run for subtest "deploy with submodules and ignored files"'
#   at t/deploy/git.t line 215.
git submodule exited with 128

-- CMD --
git submodule add file:///var/tmp/cpansmoker-1023/2024101419/Vm5GWgEjsq/submodule HASH(0x55f15a63b238)

-- STDOUT --


-- STDERR --
Cloning into '/var/tmp/cpansmoker-1023/2024101419/Vm5GWgEjsq/workdir/submodule'...

fatal: transport 'file' not allowed

fatal: clone of 'file:///var/tmp/cpansmoker-1023/2024101419/Vm5GWgEjsq/submodule' into submodule path '/var/tmp/cpansmoker-1023/2024101419/Vm5GWgEjsq/workdir/submodule' failed

# Tests were run but no plan was declared and done_testing() was not seen.
# Looks like your test exited with 255 just after 4.
t/deploy/git.t ................ 
Dubious, test returned 255 (wstat 65280, 0xff00)
Failed 1/4 subtests