Make Nextcloud NAS backups independent, verified and retryable

Makefile

@@ -1,8 +1,13 @@
-.PHONY: check install uninstall
+.PHONY: check test install uninstall
 
 check:
 	bash -n scripts/nextcloud-borg-backup scripts/install.sh scripts/uninstall.sh
-	systemd-analyze --user verify systemd/user/nextcloud-borg-backup.service systemd/user/nextcloud-borg-backup.timer
+	python3 -m py_compile scripts/nextcloud-borg-runner.py
+	systemd-analyze --user verify systemd/user/nextcloud-borg-backup.service systemd/user/nextcloud-borg-backup.timer systemd/user/nextcloud-borg-health.service systemd/user/nextcloud-borg-health.timer
+	python3 -m unittest discover -s tests -v
+
+test:
+	python3 -m unittest discover -s tests -v
 
 install:
 	./scripts/install.sh