fix(addpost): postprune image systemd service

Author: kshitijrajsharma

infra/osmsg.service

@@ -12,6 +12,7 @@ WorkingDirectory=/opt/osmsg/infra
 EnvironmentFile=/opt/osmsg/infra/.env
 ExecStartPre=/usr/bin/docker compose pull
 ExecStart=/usr/bin/docker compose up -d --remove-orphans
+ExecStartPost=-/usr/bin/docker image prune -f
 ExecStop=/usr/bin/docker compose down
 TimeoutStartSec=300
 TimeoutStopSec=60