docker-compose.yml is missing HUB_PORT_4444_TCP_PORT environment variable

[tbradley-sans]

The docker-compose.yml provided in GitHub has two errors in it. These cause this error when running the container:

ERROR: Error forwarding the new session Empty pool of VM for setup Capabilities {browserName: chrome, handlesAlerts: true, javascriptEnabled: true, locationContextEnabled: true, loggingPrefs: org.openqa.selenium.logging..., requestOrigins: {name: webdriverio, url: http://webdriver.io, version: 4.14.1}, rotatable: true}

The problem is that the environment sections need to have this:

HUB_PORT_4444_TCP_PORT=4444

Otherwise, the script that starts the selenium standalone jar file specifies a URL to connect to the HUB which is invalid, and the chrome and firefox containers can't establish a connection to the hub.

The example docker-compose.yml that's shown in README.md doesn't have this problem. It does specify HUB_PORT_4444_TCP_PORT. But the docker-compose.yml is missing that line.