feat(manager/copier): propagate Git auth env vars

[GreyTeardrop]

Changes

Propagate Git authentication variables to calls for the copier CLI.

Context

At the moment, Copier isn't able to update from templates hosted in private repositories. Renovate properly detects those updates and creates update PRs but when copier is executed to apply the update it makes its own git calls and fails to authenticate with private Git repos, resulting in a failure

failure log

Command failed: copier update --skip-answered --defaults --answers-file .copier-answers.yml --vcs-ref v1.0.5
Traceback (most recent call last):
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/bin/copier", line 8, in <module>
    sys.exit(copier_app_run())
             ~~~~~~~~~~~~~~^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/cli/application.py", line 640, in run
    inst, retcode = subapp.run(argv, exit=False)
                    ~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/cli/application.py", line 635, in run
    retcode = inst.main(*tailargs)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/cli.py", line 425, in main
    return _handle_exceptions(inner)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/cli.py", line 70, in _handle_exceptions
    method()
    ~~~~~~^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/cli.py", line 415, in inner
    with self._worker(
         ~~~~~~~~~~~~^
        dst_path=destination_path,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<4 lines>...
        overwrite=True,
        ^^^^^^^^^^^^^^^
    ) as worker:
    ^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/main.py", line 228, in __exit__
    raise value
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/cli.py", line 423, in inner
    worker.run_update()
    ~~~~~~~~~~~~~~~~~^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/main.py", line 857, in run_update
    self._check_unsafe("update")
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/main.py", line 242, in _check_unsafe
    if self.template.jinja_extensions:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/python/3.13.0/lib/python3.13/functools.py", line 1037, in __get__
    val = self.func(instance)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/template.py", line 338, in jinja_extensions
    return tuple(self.config_data.get("jinja_extensions", ()))
                 ^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/python/3.13.0/lib/python3.13/functools.py", line 1037, in __get__
    val = self.func(instance)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/template.py", line 300, in config_data
    result = filter_config(self._raw_config)[0]
                           ^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/python/3.13.0/lib/python3.13/functools.py", line 1037, in __get__
    val = self.func(instance)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/template.py", line 257, in _raw_config
    for p in self.local_abspath.glob("copier.*")
             ^^^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/python/3.13.0/lib/python3.13/functools.py", line 1037, in __get__
    val = self.func(instance)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/template.py", line 556, in local_abspath
    result = Path(clone(self.url_expanded, self.ref))
                  ~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/copier/vcs.py", line 182, in clone
    _clone()
    ~~~~~~^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/commands/base.py", line 115, in __call__
    return self.run(args, **kwargs)[1]
           ~~~~~~~~^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/commands/base.py", line 254, in run
    return p.run()
           ~~~~~^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/commands/base.py", line 217, in runner
    return run_proc(p, retcode, timeout)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/commands/processes.py", line 330, in run_proc
    return _check_process(proc, retcode, timeout, stdout, stderr)
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/commands/processes.py", line 19, in _check_process
    proc.verify(retcode, timeout, stdout, stderr)
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/containerbase/tools/copier/9.3.1/3.13.0/lib/python3.13/site-packages/plumbum/machines/base.py", line 29, in verify
    raise ProcessExecutionError(
        getattr(self, "argv", None), self.returncode, stdout, stderr
    )
plumbum.commands.processes.ProcessExecutionError: Unexpected exit code: 128
Command line: | /usr/bin/git clone --no-checkout https://github.com/GreyTeardrop/private-copier-template.git /tmp/copier.vcs.clone.z922swsv --filter=blob:none
Stderr:       | Cloning into '/tmp/copier.vcs.clone.z922swsv'...
              | fatal: could not read Username for 'https://github.com': No such device or address

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

The https://github.com/GreyTeardrop/copier-renovate-experiment repo contains test results - GreyTeardrop/copier-renovate-experiment#7 as created by stock Renovate GitHub app and GreyTeardrop/copier-renovate-experiment#6 as created by Renovate with this patch.

[renovate-release]

🎉 This PR is included in version 38.121.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 38.121.0

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