ci: adding schedule to system-tests workflow #420

Job	Run time
build	54s
system-tests / Get parameters / Get parameters	12s
system-tests / Build end-to-end (alb)	1m 20s
system-tests / Build end-to-end (apigw-rest)	1m 12s
system-tests / Build end-to-end (function-url)	1m 19s
system-tests / Build end-to-end (apigw-http)	1m 20s
system-tests / Build end-to-end (alb-multi)	1m 20s
system-tests / parametric	-1s
system-tests / End-to-end #1 / function-url 1	3m 17s
system-tests / End-to-end #1 / alb-multi 1	3m 58s
system-tests / End-to-end #1 / apigw-http 1	3m 52s
system-tests / End-to-end #1 / alb 1	3m 54s
system-tests / End-to-end #1 / apigw-rest 1	3m 50s
system-tests / Report failures	0s
	26m 27s

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