Apply `if` correctly for pre-releases #810

Job	Run time
Generate Jobs	40s
4.1.0-beta.1, 4.1.0-beta.1-management	9m 8s
4.1.0-beta.1-alpine, 4.1.0-beta.1-management-alpine	9m 14s
4.0.4, 4.0.4-management	9m 3s
4.0.4-alpine, 4.0.4-management-alpine	9m 8s
3.13.7, 3.13.7-management	8m 35s
3.13.7-alpine, 3.13.7-management-alpine	8m 13s
4.1.0-beta.1-alpine, 4.1.0-beta.1-management-alpine (i386)	10m 50s
4.0.4-alpine, 4.0.4-management-alpine (i386)	11m 3s
3.13.7-alpine, 3.13.7-management-alpine (i386)	9m 11s
	1h 25m 5s

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