Simplify and update `verify-templating.yml` #824

Job	Run time
Generate Jobs	39s
4.1.0-beta.3, 4.1.0-beta.3-management	8m 10s
4.1.0-beta.3-alpine, 4.1.0-beta.3-management-alpine	9m 18s
4.0.4, 4.0.4-management	8m 11s
4.0.4-alpine, 4.0.4-management-alpine	9m 50s
3.13.7, 3.13.7-management	8m 28s
3.13.7-alpine, 3.13.7-management-alpine	8m 15s
4.1.0-beta.3-alpine, 4.1.0-beta.3-management-alpine (i386)	11m 11s
4.0.4-alpine, 4.0.4-management-alpine (i386)	10m 49s
3.13.7-alpine, 3.13.7-management-alpine (i386)	9m 58s
	1h 24m 49s

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