Clarify execFileSync vs execFile

execFile is async with callback, but not promisified,
whereas execFileSync is synchronous & blocking

Change-type: patch

Author: cywang117

lib/compose.ts

@@ -1,4 +1,4 @@
-import { execFile as execFileSync } from 'child_process';
+import { execFile as execFileCb } from 'child_process';
 import { promisify } from 'util';
 import { randomUUID } from 'crypto';
 import * as path from 'path';
@@ -23,7 +23,7 @@ import type {
 	ImageDescriptor,
 } from './types';
 
-const execFile = promisify(execFileSync);
+const execFile = promisify(execFileCb);
 
 /**
  * Parse one or more compose files using compose-go, and return a normalized composition object