feat(gatsby): add flag to disable schema rebuilding (#26291)

Author: vladar

packages/gatsby/src/services/build-schema.ts

@@ -4,7 +4,14 @@ import { IDataLayerContext } from "../state-machines/data-layer/types"
 
 export async function buildSchema({
   parentSpan,
+  refresh,
 }: Partial<IDataLayerContext>): Promise<void> {
+  if (
+    refresh &&
+    Boolean(process.env.GATSBY_EXPERIMENTAL_DISABLE_SCHEMA_REBUILD)
+  ) {
+    return
+  }
   const activity = reporter.activityTimer(`building schema`, {
     parentSpan,
   })