startup perms
Running this on Kubernetes and trying to use the startup.ah as a configmap errors because because kubernetes mounts these is read-only. The container never starts because it fails to chown that file. I was hoping you could add `-f` flag to the chown command on /homebridge. That way if it does error it won't change the exit code.

**Logs:**
```
chown: changing ownership of '/homebridge/startup.sh': Read-only file system
```