add microdnf defaults to site-defaults.cfg

Author: xsuchy

mock/etc/mock/site-defaults.cfg

@@ -346,6 +346,12 @@ config_opts['bootstrap_module_install'] = []
 # config_opts['dnf_common_opts'] = ['--disableplugin=local', '--setopt=deltarpm=False']
 # config_opts['yum_builddep_opts'] = []
 # config_opts['dnf_builddep_opts'] = []
+# config_opts['microdnf_command'] = '/usr/bin/microdnf'
+## "dnf-install" is special keyword which tells mock to use install but with DNF
+# config_opts['microdnf_install_command'] = 'dnf-install microdnf dnf dnf-plugins-core distribution-gpg-keys'
+# config_opts['microdnf_builddep_command'] = '/usr/bin/dnf'
+# config_opts['microdnf_builddep_opts'] = []
+# config_opts['microdnf_common_opts'] = []
 # config_opts['priorities.conf'] = 'put file contents here.'
 # config_opts['rhnplugin.conf'] = 'put file contents here.'
 ## Important! You should register your host machine first!