Aurora Services on LineageOS
Unsure about installation instructions on https://gitlab.com/AuroraOSS/AuroraServices some searching found https://gitlab.com/AuroraOSS/AuroraServices/-/issues/5 so thought I’d try sideloading from LineageOS recovery.
Not working, then found https://gitlab.com/AuroraOSS/AuroraServices/-/issues/51. Last comment mentions Fdroid so downloaded https://f-droid.org/en/packages/org.fdroid.fdroid.privileged.ota/ and noticed the update-binary script was doing mount "/dev/block/bootdevice/by-name/system" "$MOUNT_POINT". So tried mount /dev/block/bootdevice/by-name/system_a /mnt/system from adb shell which worked.
So falling back to the old instructions copied the apk to /mnt/system/system/priv-app and permissions to /mnt/system/system/etc/permissions/ (these were in /tmp from the sideload). Umount and reboot, select Aurora Services in Aurora settings then worked and updated apps without prompting.