ci: adding schedule to system-tests workflow #418

Job	Run time
build	1m 7s
system-tests / Get parameters / Get parameters	15s
system-tests / Build end-to-end (alb-multi)	1m 18s
system-tests / Build end-to-end (function-url)	1m 12s
system-tests / Build end-to-end (apigw-rest)	1m 14s
system-tests / Build end-to-end (alb)	1m 17s
system-tests / Build end-to-end (apigw-http)	1m 24s
system-tests / parametric	0s
system-tests / End-to-end #1 / apigw-http 1	3m 55s
system-tests / End-to-end #1 / apigw-rest 1	3m 46s
system-tests / End-to-end #1 / function-url 1	3m 34s
system-tests / End-to-end #1 / alb 1	3m 9s
system-tests / End-to-end #1 / alb-multi 1	4m 22s
system-tests / Report failures	0s
	26m 33s

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