koji_builders: disable nosync in stg

nosync has some glibc symbols that break when doing older chroots on f35
hosts. This breaks epel7 builds for example.
https://bugzilla.redhat.com/show_bug.cgi?id=2019329
So, until thats sorted, disable nosync

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/koji_builder/templates/builders/site-defaults.cfg

@@ -2,8 +2,10 @@ config_opts['plugin_conf']['package_state_enable'] = False
 config_opts['plugin_conf']['ccache_enable'] = False
 config_opts['dnf_common_opts'] = ['--setopt=install_weak_deps=0']
 config_opts['macros']['%bugurl'] = 'https://bugz.fedoraproject.org/%name'
+{% if env == "staging" %}
 config_opts['nosync'] = True
 config_opts['nosync_force'] = True
+{% endif %}
 config_opts['environment']['LANG'] = 'C.UTF-8'
 config_opts['use_bootstrap'] = True
 config_opts['yum_install_command'] += " -x devtoolset*"