OcpSandbox scheduling: skip masters in calculation #328

Job	Run time
pull_request	1m 42s
build-and-push-admin / build-and-push	2m 51s
build-and-push-api / build-and-push	1m 35s
build-and-push-conan / build-and-push	3m 45s
	9m 53s

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