Apps with jobs that only run on delete don't become ready

If a user creates an app with the following Acornfile, the app will be stuck in a "pending" status and will never become ready.
```cue
containers: web: {
	image: "nginx"
	ports: publish: "80/http"
	files: {
		"/usr/share/nginx/html/index.html": "<h1>My First Acorn!!</h1>"
	}
}

jobs: "delete-job": {
	image: "busybox"
	command: ["sleep", "10s"]
	events: ["delete"]
}

```