use lua lookup for userdb

rootfs/etc/confd/templates/auth-oauth2.conf.ext.tmpl

@@ -10,7 +10,12 @@ passdb {
   args = /etc/dovecot/dovecot-oauth2.plain.conf.ext
 }
 
+#userdb {
+#  driver = static
+#  args = uid=vmail gid=vmail username_format=%n home=/var/lib/vmail/mail/%n
+#}
+
 userdb {
-  driver = static
-  args = uid=vmail gid=vmail username_format=%n home=/var/lib/vmail/mail/%n
+  driver = lua
+  args = file=/etc/dovecot/oauth2-userdb-lua blocking=yes
 }

rootfs/etc/confd/templates/dovecot-oauth2.token.conf.ext.tmpl

@@ -9,3 +9,4 @@ use_grant_password = no
 pass_attrs = pass=%{oauth2:access_token}
 debug = yes
 username_format = %n
+