custom: add support for custom container #197

Job	Run time
Formatting	50s
test-metrics (app-lammps, ghcr.io/converged-computing/metric-lammps:latest, 120)	5m 40s
Unit Tests	1m 23s
test-metrics (perf-hello-world, ghcr.io/converged-computing/metric-sysstat:latest, 60)	4m 28s
test-metrics (io-host-volume, ghcr.io/converged-computing/metric-sysstat:latest, 60)	5m 31s
test-metrics (io-fio, ghcr.io/converged-computing/metric-fio:latest, 120)	5m 44s
test-metrics (io-ior, ghcr.io/converged-computing/metric-ior:latest, 120)	5m 30s
test-metrics (app-nekbone, ghcr.io/converged-computing/metric-nekbone:latest, 120)	5m 53s
test-metrics (app-ldms, ghcr.io/converged-computing/metric-ovis-hpc:latest, 120)	6m 1s
test-metrics (app-cabanaPIC, ghcr.io/converged-computing/metric-cabanapic:latest, 120)	5m 43s
test-metrics (app-amg, ghcr.io/converged-computing/metric-amg:latest, 120)	5m 57s
test-metrics (app-kripke, ghcr.io/converged-computing/metric-kripke:latest, 120)	7m 59s
test-metrics (app-pennant, ghcr.io/converged-computing/metric-pennant:latest, 120)	5m 23s
test-metrics (app-bdas, ghcr.io/converged-computing/metric-bdas:latest, 120)	6m 18s
test-metrics (app-quicksilver, ghcr.io/converged-computing/metric-quicksilver:latest, 120)	5m 55s
	1h 18m 15s

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