[CI] Reduce CLI log output in CI jobs (#2934)

## Motivation for the change, related issues

Prevents printing all the progress updates in CI / dumb terminal to
avoid generating 20MB of `downloading WordPress: 17.46%` lines.

Author: adamziel

packages/playground/cli/src/utils/progress.ts

@@ -1,17 +1,20 @@
 export function shouldRenderProgress(
 	writeStream?: { isTTY?: boolean } | null
 ): boolean {
-	const termIsDumb = (process.env['TERM'] || '').toLowerCase() === 'dumb';
-	const ciFlag = (process.env['CI'] || '').toLowerCase();
-	const runningInCI = ciFlag === '1' || ciFlag === 'true';
-
-	if (termIsDumb || runningInCI) {
+	if (process.env['CI'] === 'true' || process.env['CI'] === '1') {
+		return false;
+	}
+	if (
+		process.env['GITHUB_ACTIONS'] === 'true' ||
+		process.env['GITHUB_ACTIONS'] === '1'
+	) {
+		return false;
+	}
+	if ((process.env['TERM'] || '').toLowerCase() === 'dumb') {
 		return false;
 	}
-
 	if (writeStream) {
 		return Boolean(writeStream.isTTY);
 	}
-
-	return true;
+	return process.stdout.isTTY;
 }