.env variables ignored - manual setup

I'm running with a manual setup and would like to change the port:

.env

```
# PrintVault Configuration
PORT=4000
NODE_ENV=production
validate: {xForwardedForHeader: false} 
```

result of npm start:

```
> gyroid-vault@1.3.4 start
> node server/index.js

✓ Database initialized
GyroidVault running on http://0.0.0.0:3000
Starting background library scanner (interval: 24 hours)
```

