website: env var: add LIMA_SSH_PORT_FORWARDER

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

website/content/en/docs/config/environment-variables.md

@@ -47,6 +47,17 @@ This page documents the environment variables used in Lima.
   lima
   ```
 
+### `LIMA_SSH_PORT_FORWARDER`
+
+- **Description**: Specifies to use the SSH port forwarder (slow, stable) instead of gRPC (fast, unstable)
+- **Default**: `true`
+- **Usage**: 
+  ```sh
+  export LIMA_SSH_PORT_FORWARDER=false
+  ```
+- **Note**: It is expected that this variable will be set to `false` by default in future
+  when the gRPC port forwarder is well matured.
+
 ### `LIMA_USERNET_RESOLVE_IP_ADDRESS_TIMEOUT`
 
 - **Description**: Specifies the timeout duration for resolving the IP address in usernet.