diesel: create a schema.rs include

* to satisfy the compiler with enabled warnings macro finding
  missing documentation strings, this patch will include an allow
  rule for the resulting 'schema.rs' file

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

diesel.toml

@@ -1,6 +1,8 @@
 # For documentation on how to configure this file,
-# see diesel.rs/guides/configuring-diesel-cli
+# see https://diesel.rs/guides/configuring-diesel-cli
 
 [print_schema]
 file = "src/schema.rs"
 #filter = { only_tables = [ "User", "UserRole" ] }
+# includes the "#![allow(missing_docs)]"
+patch_file = "src/missing_docs.patch"