fix: create locale column when migrating from v4

packages/core/core/src/migrations/database/5.0.0-discard-drafts.ts

@@ -1,4 +1,6 @@
 /* eslint-disable no-continue */
+import { isNil } from 'lodash/fp';
+
 import type { UID } from '@strapi/types';
 import type { Database, Migration } from '@strapi/database';
 import { async, contentTypes } from '@strapi/utils';
@@ -47,6 +49,19 @@ async function* getBatchToDiscard({
   }
 }
 
+/**
+ * This migration makes use of the document service,
+ * which assumes the `locale` column always exists.
+ * In v4, that was not the case, for content types with i18n disabled.
+ *
+ * This function creates the `locale` column if it doesn't exist.
+ */
+const createLocaleColumn = async (db: Knex, tableName: string) => {
+  await db.schema.alterTable(tableName, (table) => {
+    table.string('locale');
+  });
+};
+
 const migrateUp = async (trx: Knex, db: Database) => {
   for (const meta of db.metadata.values()) {
     const hasTable = await trx.schema.hasTable(meta.tableName);
@@ -62,6 +77,11 @@ const migrateUp = async (trx: Knex, db: Database) => {
       continue;
     }
 
+    // Create locale column if it doesn't exist
+    if (isNil(meta.attributes.locale)) {
+      await createLocaleColumn(trx, meta.tableName);
+    }
+
     const discardDraft = async (entry: DocumentVersion) =>
       strapi
         .documents(uid)