tests/functional: make tuxrun disk images writable

The zstd command will preserve the input archive permissions on the
output file. So when we decompress the readonly cached image, the
resulting per-test run private disk image will also be readonly.
We need it to be writable, so make it so.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241025092659.2312118-2-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed