Fedora 40 support

Signed-off-by: Jason Rothstein <fdragon@fdragon.org>

templates/Fedora/40/etc/dovecot/conf.d/auth-passwdfile.conf.ext

@@ -0,0 +1,20 @@
+# Authentication for passwd-file users. Included from 10-auth.conf.
+#
+# passwd-like file with specified location.
+# <doc/wiki/AuthDatabase.PasswdFile.txt>
+
+passdb {
+  driver = passwd-file
+  args = scheme=CRYPT username_format=%u /etc/dovecot/users
+}
+
+userdb {
+  driver = passwd-file
+  args = username_format=%u /etc/dovecot/users
+
+  # Default fields that can be overridden by passwd-file
+  #default_fields = quota_rule=*:storage=1G
+
+  # Override fields from passwd-file
+  #override_fields = home=/home/virtual/%u
+}