Previously, likely do to some git update the following error was
produced:

```
Testing: Verify mock 'gcevm' flavor main() workflow produces expected
output
fail - Expected exit-code 0 but received 128 while executing
mock_gcevm_workflow (output follows)
Winning lottery-number checksum: 0
gcloud --configuration=automation_images --project=automation_images
compute instances create --zone=us-central1-a
--image-project=automation_images --image=test-image-name --custom-cpu=0
--custom-memory=0Gb --boot-disk-size=0 --labels=in-use-by=foobar
foobar-test-image-name
gcloud --configuration=automation_images --project=automation_images
compute ssh --ssh-flag=-o=AddKeysToAgent=yes --force-key-file-overwrite
--strict-host-key-checking=no --zone=us-central1-a
root@foobar-test-image-name -- true
Cloning into '/tmp/get_ci_vm_hRxAoX.tmp/var/tmp/automation_images'...
fatal: detected dubious ownership in repository at
'/tmp/cirrus-ci-build/get_ci_vm/good_repo_test/.git'
To add an exception for this directory, call:

  git config --global --add safe.directory
/tmp/cirrus-ci-build/get_ci_vm/good_repo_test/.git
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
```

Fix this.

Signed-off-by: Chris Evich <cevich@redhat.com>