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Pass archname through env to avoid template injection #726

Job	Run time
omnibus compilations, trigger	4s
omnibus compilations, #4	25m 20s
omnibus compilations, #2	35m 59s
omnibus compilations, #6	26m 48s
omnibus compilations, #5	27m 31s
omnibus compilations, #1	30m 12s
omnibus compilations, #10	28m 30s
omnibus compilations, #12	15m 6s
omnibus compilations, #3	34m 48s
omnibus compilations, #9	28m 46s
omnibus compilations, #7	35m 3s
omnibus compilations, #8	28m 5s
omnibus compilations, #11	25m 24s
omnibus compilations, result	6s
	5h 41m 42s