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FROM pwn.red/jailCOPY --from=ubuntu@sha256:77906da86b60585ce12215807090eb327e7386c8fafb5402369e421f44eff17e / /srvCOPY stacksort /srv/app/runCOPY flag.txt /srv/app/flag.txtRUN chmod 755 /srv/app/runENV JAIL_TIME=99999999