Add few compiler warning flags to error #401

Job	Run time
binary (humble, main) / humble main	3m 30s
binary (humble, testing) / humble testing	3m 30s
binary (iron, main) / iron main	3m 28s
binary (iron, testing) / iron testing	3m 32s
binary (jazzy, main) / jazzy main	3m 25s
binary (jazzy, testing) / jazzy testing	3m 35s
binary (rolling, main) / rolling main	3m 41s
binary (rolling, testing) / rolling testing	3m 50s
	28m 31s

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