CI: Attempt to set ENV not for Windows #267

Job	Run time
ruby-versions / Generate Ruby versions	6s
build (2.5, 0.1.7, /tmp/local)	45s
build (2.5, 0.1.7)	27s
build (2.5, 0.2.5, /tmp/local)	1m 10s
build (2.5, 0.2.5)	31s
build (2.6, 0.1.7, /tmp/local)	47s
build (2.6, 0.1.7)	28s
build (2.6, 0.2.5, /tmp/local)	47s
build (2.6, 0.2.5)	28s
build (2.7, 0.1.7, /tmp/local)	58s
build (2.7, 0.1.7)	27s
build (2.7, 0.2.5, /tmp/local)	51s
build (2.7, 0.2.5)	30s
build (3.0, 0.1.7, /tmp/local)	21s
build (3.0, 0.1.7)	16s
build (3.0, 0.2.5, /tmp/local)	23s
build (3.0, 0.2.5)	17s
build (3.1, 0.1.7, /tmp/local)	24s
build (3.1, 0.1.7)	19s
build (3.1, 0.2.5, /tmp/local)	24s
build (3.1, 0.2.5)	18s
build (3.2, 0.1.7, /tmp/local)	26s
build (3.2, 0.1.7)	27s
build (3.2, 0.2.5, /tmp/local)	23s
build (3.2, 0.2.5)	15s
build (3.3, 0.1.7, /tmp/local)	46s
build (3.3, 0.1.7)	16s
build (3.3, 0.2.5, /tmp/local)	22s
build (3.3, 0.2.5)	15s
build (head, 0.1.7, /tmp/local)	19s
build (head, 0.1.7)	22s
build (head, 0.2.5, /tmp/local)	39s
build (head, 0.2.5)	15s
	15m 42s

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