Adds auto-update to containers, enables auto-update for root, sync only at 8 and 20, excludes some files from sync

quadlets/synapse/synapse.container

@@ -9,6 +9,7 @@ ContainerName=synapse
 Environment=SYNAPSE_CONFIG_PATH=/data/homeserver.yaml
 Environment=TZ=Europe/Zurich
 Image=docker.io/matrixdotorg/synapse:latest
+Label=io.containers.autoupdate=registry
 Pod=synapse.pod
 StartWithPod=true
 Timezone=Europe/Zurich