fix: use correct temp dir

[bobbyg603]

When we package up our node app, the way you find the current working directory is different:

value	with node	packaged	comments
__filename	/project/app.js	/snapshot/project/app.js
__dirname	/project	/snapshot/project
process.cwd()	/project	/deploy	suppose the app is called ...
process.execPath	/usr/bin/nodejs	/deploy/app-x64	app-x64 and run in /deploy
process.argv[0]	/usr/bin/nodejs	/deploy/app-x64
process.argv[1]	/project/app.js	/snapshot/project/app.js
process.pkg.entrypoint	undefined	/snapshot/project/app.js
process.pkg.defaultEntrypoint	undefined	/snapshot/project/app.js
require.main.filename	/project/app.js	/snapshot/project/app.js

source: https://github.com/vercel/pkg#snapshot-filesystem

that change just prefers process.cwd() over __dirname which i found out by referencing that chart in pkg