isc: fix container names #113

Job	Run time
setup_shared_matrix	1m 52s
build_hub_container (isc-2026, 2026-ISC, linux, amd64, docker/Dockerfile.hub, ghcr.io/llnl/reprod...	2m 36s
build_caliper_container (isc-2026, 2026-ISC, linux, amd64, docker/Dockerfile.caliper, ghcr.io/lln...	5m 11s
build_init_container (isc-2026, 2026-ISC, linux, amd64, docker/Dockerfile.init, ghcr.io/llnl/repr...	2m 47s
build_thicket_container (isc-2026, 2026-ISC, linux, amd64, docker/Dockerfile.thicket, ghcr.io/lln...	6m 45s
build_treescape_container (isc-2026, 2026-ISC, linux, amd64, docker/Dockerfile.treescape, ghcr.io...	5m 18s
build_benchpark_container (isc-2026, 2026-ISC, linux, amd64, docker/Dockerfile.benchpark, ghcr.io...	6m 9s
build_spawn_container	-1s
	30m 37s

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