fix: cyclic depedency

rollback to have dependency on update of /var or /etc and
After=systemd-update-done as its breaking the boot cycle.

Signed-off-by: saypaul <saypaul@redhat.com>

Author: say-paul

usr/lib/systemd/system/greenboot-rollback.service

@@ -1,8 +1,10 @@
 [Unit]
 Description=Greenboot Rollback Mechanism
-After=systemd-update-done.service greenboot-healthcheck.service
+After=greenboot-healthcheck.service
+Before=systemd-update-done.service
 OnFailureJobMode=fail
-Requisite=systemd-update-done.service
+ConditionNeedsUpdate=|/etc
+ConditionNeedsUpdate=|/var
 
 [Service]
 Type=oneshot