Stat server port conflicts with user's application's port

[joshuatshaffer]

The stat collector port is read from an env variable in the server, but in the client it is defined as a constant.

workflow-telemetry-action/src/statCollectorWorker.ts

Lines 15 to 19 in f974e0c

	// TODO
	// It is better to find an available/free port automatically and use it.
	// Then the post script (`post.ts`) needs to know the selected port.
	const SERVER_PORT: number =
	parseInt(process.env.WORKFLOW_TELEMETRY_SERVER_PORT || '') || 7777

workflow-telemetry-action/src/statCollector.ts

Line 25 in f974e0c

const STAT_SERVER_PORT = 7777

This conflicts with one of the ports my application is already using. If both places read from a environment variable I could change this to a different port. I could change my application's port but it would be better if I could configure this action's port.