Create the rails project and build docker-compose.

app/javascript/channels/consumer.js

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+// Action Cable provides the framework to deal with WebSockets in Rails.
+// You can generate new channels where WebSocket features live using the `rails generate channel` command.
+
+import { createConsumer } from "@rails/actioncable"
+
+export default createConsumer()

app/javascript/channels/index.js

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+// Load all the channels within this directory and all subdirectories.
+// Channel files must be named *_channel.js.
+
+const channels = require.context('.', true, /_channel\.js$/)
+channels.keys().forEach(channels)