schema: add a script to re-export the schema

.github/workflows/rust.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Generate GraphQL schema
         run: cargo run -- export_graphql_schema -o generated_schema.graphql
       - name: Check schema
-        run: diff schema.graphql generated_schema.graphql
+        run: diff schema.graphql generated_schema.graphql || (echo "The schema file is out of date. Please run `./export_schema.sh`" && false)
 
 
   clippy:

export_schema.sh

@@ -0,0 +1,5 @@
+#! /bin/sh
+
+cd $(dirname $(readlink -f "$0"))
+
+cargo run -- export_graphql_schema -o schema.graphql