docs: docs for next release (#14110)

www/apps/book/app/learn/fundamentals/admin/environment-variables/page.mdx

@@ -1,3 +1,5 @@
+import { Table } from "docs-ui"
+
 export const metadata = {
   title: `${pageNumber} Environment Variables in Admin Customizations`,
 }
@@ -88,6 +90,70 @@ Learn more about other Vite environment variables in the [Vite documentation](ht
 
 ---
 
+## Predefined Environment Variables
+
+You can further customize the Medusa Admin behavior using the following predefined environment variables. You can set the environment variables in your `.env` file or in your deployment platform.
+
+<Note>
+
+The following pre-defined environment variables are available starting [Medusa v2.12.0](https://github.com/medusajs/medusa/releases/tag/v2.12.0).
+
+</Note>
+
+<Table>
+  <Table.Header>
+    <Table.Row>
+      <Table.HeaderCell>
+        Environment Variable
+      </Table.HeaderCell>
+      <Table.HeaderCell>
+        Description
+      </Table.HeaderCell>
+      <Table.HeaderCell>
+        Default
+      </Table.HeaderCell>
+    </Table.Row>
+  </Table.Header>
+  <Table.Body>
+    <Table.Row>
+      <Table.Cell>
+      
+      `ADMIN_AUTH_TYPE`
+
+      </Table.Cell>
+      <Table.Cell>
+
+      A string indicating the authentication method that the JS SDK instance uses in the Medusa Admin. Possible values are `session` and `jwt`. Learn more in the [JS SDK Authentication guide](!resources!/js-sdk/auth/overview).
+
+      </Table.Cell>
+      <Table.Cell>
+
+      `session`
+
+      </Table.Cell>
+    </Table.Row>
+    <Table.Row>
+      <Table.Cell>
+      
+      `ADMIN_JWT_TOKEN_STORAGE_KEY`
+
+      </Table.Cell>
+      <Table.Cell>
+
+      A string indicating the key used to store the authentication JWT token in the browser's local storage. Only applicable if `ADMIN_AUTH_TYPE` is set to `jwt`.
+
+      </Table.Cell>
+      <Table.Cell>
+
+      `medusa_auth_token`
+
+      </Table.Cell>
+    </Table.Row>
+  </Table.Body>
+</Table>
+
+---
+
 ## Environment Variables in Production
 
 When you build the Medusa application, including the Medusa Admin, with the `build` command, the environment variables are inlined into the build. This means that you can't change the environment variables without rebuilding the application.