docs: add podman ulimit option (#13180)

website/content/plugins/drivers/podman.mdx

@@ -364,6 +364,18 @@ The `podman` driver implements the following [capabilities](/docs/internals/plug
   }
   ```
 
+- `ulimit` - (Optional) A key-value map of ulimit configurations to set to the
+  containers to start.
+
+  ```hcl
+  config {
+    ulimit {
+      nproc  = "4242"
+      nofile = "2048:4096"
+    }
+  }
+  ```
+
 ## Network Configuration
 
 Nomad [lifecycle hooks][nomad_lifecycle_hooks] combined with the drivers