chore(doc): restore federation troubleshooting

Author: iru

README.md

@@ -98,11 +98,19 @@ Notice that:
 ## Troubleshooting
 
 - Q1: Getting "Error creating WorkloadIdentityPool: googleapi: Error 409: Requested entity already exists"<br/>
-  A: This is default behaviour we cannot control
-    https://cloud.google.com/iam/docs/manage-workload-identity-pools-providers#delete-pool
-    > You can undelete a pool for up to 30 days after deletion. After 30 days, deletion is permanent. Until a pool is permanently deleted, you cannot reuse its name when creating a new workload identity pool.<br/>
-
-  S: Use the `naming_prefix` input variable to create a differet workload identity federation.
+  A1: This is default behaviour we cannot control
+  https://cloud.google.com/iam/docs/manage-workload-identity-pools-providers#delete-pool
+    > You can undelete a pool for up to 30 days after deletion. After 30 days, deletion is permanent. Until a pool is permanently deleted, you cannot reuse its   name when creating a new workload identity pool.<br/>
+
+  S1: Use the `naming_prefix` input variable to create a differet workload identity federation.
+  ```bash
+  # re-activate
+  $ gcloud iam workload-identity-pools undelete sysdigcloud  --location=global
+  
+  # import to terraform state
+  $ terraform import module.secure-for-cloud_example_single-project.module.cloud_bench.google_iam_workload_identity_pool.pool sysdigcloud
+  $ terraform import module.secure-for-cloud_example_single-project.module.cloud_bench.google_iam_workload_identity_pool_provider.pool_provider sysdigcloud/sysdigcloud
+   ```