Add configurable ntfy options (tokenFile, url, topic) to the shared
emailOnFailure module. When tokenFile is set, a ntfy-failure@ template
service is added alongside the existing email notifications. Systems
without ntfy configured are unaffected.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Added `emailOnFailure.enable` option to metacfg with a default of `false`.
- Enabled email notifications on failure for SGX and MX systems.
- Enhanced `systemd-email-notify` module to support the new configuration.
Introduce a NixOS module for sending service status emails on failures via systemd. The module provides configurable options for email recipients and integrates with the `sendmail` utility to notify admins about service issues.
