Use short service DNS (garm.garm.svc:80) instead of FQDN (garm.garm.svc.cluster.local:80) to match what the stack template now generates. Ref: IPCEICIS-6886
Move sizer-receiver from stacks/garm/ to stacks/ci-sizer/ for dev.t09.de only. edp.buildth.ing stays in garm (not deployed yet).