Adding SE_NODE_GRID_URL to compose example

[skip ci]

Author: diemol

README.md

@@ -390,7 +390,8 @@ docker run -d -e SCREEN_WIDTH=1366 -e SCREEN_HEIGHT=768 -e SCREEN_DEPTH=24 -e SC
 ### Grid Url and Session Timeout
 
 In some use cases you might need to set the Grid url to the Node, for example if you'd like to access the CDP endpoint. You
-can do that through the `SE_NODE_GRID_URL` environment variable. 
+can do that through the `SE_NODE_GRID_URL` environment variable. Setting this env var is needed if you want to see the live
+view while sessions are executing.
 
 Grid has a default session timeout of 300 seconds, where the session can be on a stale state until it is killed. You can use
 `SE_NODE_SESSION_TIMEOUT` to overwrite that value in seconds.

docker-compose-v3.yml

@@ -1,5 +1,6 @@
 # To execute this docker-compose yml file use `docker-compose -f docker-compose-v3.yml up`
 # Add the `-d` flag at the end for detached execution
+# Change "SE_NODE_GRID_URL=http://localhost:4444" to the URL/IP where the Grid is accesible.
 # To stop the execution, hit Ctrl+C, and then `docker-compose -f docker-compose-v3.yml down`
 version: "3"
 services:
@@ -12,6 +13,7 @@ services:
       - SE_EVENT_BUS_HOST=selenium-hub
       - SE_EVENT_BUS_PUBLISH_PORT=4442
       - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
+      - SE_NODE_GRID_URL=http://localhost:4444
     ports:
       - "6900:5900"
 
@@ -24,6 +26,7 @@ services:
       - SE_EVENT_BUS_HOST=selenium-hub
       - SE_EVENT_BUS_PUBLISH_PORT=4442
       - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
+      - SE_NODE_GRID_URL=http://localhost:4444
     ports:
       - "6901:5900"
 
@@ -36,6 +39,7 @@ services:
       - SE_EVENT_BUS_HOST=selenium-hub
       - SE_EVENT_BUS_PUBLISH_PORT=4442
       - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
+      - SE_NODE_GRID_URL=http://localhost:4444
     ports:
       - "6902:5900"