Add Iron CI (#311) #389

Job	Run time
diagnostic_aggregator on humble	6m 55s
diagnostic_aggregator on iron	11m 25s
diagnostic_aggregator on rolling	4m 38s
diagnostic_common_diagnostics on humble	6m 1s
diagnostic_common_diagnostics on iron	7m 41s
diagnostic_common_diagnostics on rolling	12m 19s
diagnostic_updater on humble	4m 33s
diagnostic_updater on iron	12m 13s
diagnostic_updater on rolling	9m 47s
self_test on humble	5m 4s
self_test on iron	6m 56s
self_test on rolling	6m 15s
	1h 33m 47s

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