Merge pull request 2i2c-org#1653 from sgibson91/update-template

.github/ISSUE_TEMPLATE/4_decommission-hub.md

@@ -44,6 +44,7 @@ Usually, it is because it was a hub that we created for a workshop/conference an
 _This phase is only necessary for single hub clusters._
 
 - [ ] Run `terraform plan -destroy` and `terraform apply` from the [appropriate workspace](https://infrastructure.2i2c.org/en/latest/topic/terraform.html#workspaces), to destroy the cluster
+- [ ] Delete the terraform workspace: `terraform workspace delete <NAME>`
 - [ ] Remove the associated `config/clusters/<cluster_name>` directory and all its contents
 - Remove the cluster from CI:
   - [ ] [`deploy-hubs.yaml`](https://github.com/2i2c-org/infrastructure/blob/HEAD/.github/workflows/deploy-hubs.yaml)