Add a template for device weekly releases

<!-- If needed, you can edit the template at https://gitlab.e.foundation/e/os/releases/-/edit/master/.gitlab/issue_templates/device-weekly-release.md -->

## To-do

### Devices team

- [ ] Configure build system

- [ ] Configure release system

### Test team

- [ ] Run a test session (if testers available)

### Communication team

- [ ] Prepare documentation

- [ ] Prepare communication

### On release day

- [ ] Publish builds

- [ ] Publish documentation

- [ ] Communicate

## Devices of the week

### New devices

- **Android Q**

- **Android Pie**

### Upgraded devices

- **to Android Q**

- **to Android Pie**

- **to Android Oreo**

/confidential