Merge pull request #5257 from ministryofjustice/add-ulimit-note

Add ulimit note

runbooks/source/creating-a-live-like.html.md.erb

@@ -37,6 +37,9 @@ to the configuration similar to the live cluster.
 > To find components that are enabled in live but not in test you can search for `lookup(local.live_workspace, terraform.workspace, false)` in `components.tf`.
 
 2. Add the `starter_pack_count = 40` variable to the starter_pack module
+
+> Sometimes terraform will error out with an unclear error message this is usually due to a low default `ulimit` to fix this you can set `ulimit -n 2048`
+
 3. Run `terraform plan` and confirm that your changes are correct
 4. Run `terraform apply` to apply the changes to your test cluster
 5. You may need to run `plan` and `apply` again as the starter pack addons don't like to be installed all at once